{
 "version": "2026.10.24-1",
 "updated": "2026-10-24",
 "disclaimer": "Informational only. The league, tournament director or umpire has the final say.",
 "not_affiliated": "CheckMyBat.com is not affiliated with, endorsed by or sponsored by USA Baseball, USSSA or any league or tournament organization named here.",
 "stamps": {
  "usa": {
   "label": "USA Baseball (USABat) mark",
   "short": "USA Baseball",
   "inherent_max_barrel": 2.625,
   "where": "Look on the taper (just above the grip) or barrel for the USA Baseball logo with 'USABat' / 'USA Baseball'."
  },
  "usssa": {
   "label": "USSSA 1.15 BPF stamp",
   "short": "USSSA 1.15 BPF",
   "inherent_max_barrel": 2.75,
   "where": "Look on the taper for the USSSA thumbprint logo with '1.15 BPF'."
  },
  "bbcor": {
   "label": "BBCOR .50 certification mark",
   "short": "BBCOR .50",
   "inherent_max_barrel": 2.625,
   "inherent_drop": 3,
   "where": "Look on the barrel for a rectangular mark reading 'BBCOR .50' (or the new 'USA Baseball BBCOR'). These bats are always -3."
  },
  "wood": {
   "label": "one-piece wood (no stamp)",
   "short": "one-piece wood",
   "inherent_max_barrel": null,
   "where": "Solid one-piece wood bats carry no performance stamp. Multi-piece, laminated or wood-composite bats are NOT 'wood' for rules purposes and need a stamp."
  }
 },
 "drop_note": "max_drop is the absolute drop: max_drop 5 means a bat may be no lighter than -5 (length minus weight).",
 "leagues": [
  {
   "id": "little-league",
   "name": "Little League Baseball",
   "short": "Little League",
   "slugs": [
    "ll",
    "littleleague"
   ],
   "standards": [
    "USABat",
    "BBCOR (Intermediate/Junior/Senior)"
   ],
   "confidence": "verified",
   "source_url": "https://www.littleleague.org/playing-rules/bat-rules/",
   "source_label": "Little League Rule 1.10 (bat rules page, updated July 7, 2026)",
   "site_page": "/leagues/little-league.html",
   "notes": "All BPF 1.15 (USSSA) bats are prohibited. Solid one-piece wood bats need no USA mark. Altered bats and choke-up devices are illegal; an illegible mark makes the bat illegal.",
   "divisions": [
    {
     "id": "tee-ball",
     "name": "Tee Ball",
     "aliases": [
      "teeball",
      "t-ball",
      "tball"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 26
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 26
      }
     ],
     "rule": "Little League Tee Ball: USA Baseball-certified Tee Ball bats (26\" and shorter) marked 'ONLY FOR USE WITH APPROVED TEE BALLS'; max 2 5/8\" diameter."
    },
    {
     "id": "minors",
     "name": "Minors (incl. coach/machine pitch)",
     "aliases": [
      "minor",
      "aa",
      "aaa",
      "coach-pitch",
      "machine-pitch"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 33
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 33
      }
     ],
     "rule": "Little League Rule 1.10 (Minor/Major): non-wood bats must bear the USA Baseball logo; max 33\" long and 2 5/8\" diameter; all BPF 1.15 bats are prohibited."
    },
    {
     "id": "majors",
     "name": "Majors",
     "aliases": [
      "major",
      "12u",
      "11u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 33
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 33
      }
     ],
     "rule": "Little League Rule 1.10 (Minor/Major): non-wood bats must bear the USA Baseball logo; max 33\" long and 2 5/8\" diameter; all BPF 1.15 bats are prohibited."
    },
    {
     "id": "intermediate",
     "name": "Intermediate (50/70)",
     "aliases": [
      "50-70",
      "5070",
      "int",
      "13u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 34
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_length": 34
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 34
      }
     ],
     "rule": "Little League Rule 1.10 (Intermediate 50/70 & Junior): USA Baseball logo OR BBCOR mark; max 34\" long and 2 5/8\" diameter; BPF 1.15 prohibited."
    },
    {
     "id": "junior",
     "name": "Junior League",
     "aliases": [
      "juniors",
      "jr",
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 34
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_length": 34
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 34
      }
     ],
     "rule": "Little League Rule 1.10 (Intermediate 50/70 & Junior): USA Baseball logo OR BBCOR mark; max 34\" long and 2 5/8\" diameter; BPF 1.15 prohibited."
    },
    {
     "id": "senior",
     "name": "Senior League",
     "aliases": [
      "seniors",
      "sr",
      "15u",
      "16u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 36
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 36
      }
     ],
     "rule": "Little League Rule 1.10 (Senior): all bats not made of one piece of wood must be BBCOR; max 36\" long, 2 5/8\" diameter, no lighter than -3."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "cal-ripken",
   "name": "Cal Ripken Baseball (Babe Ruth League, ages 4-12)",
   "short": "Cal Ripken",
   "slugs": [
    "ripken",
    "calripken"
   ],
   "standards": [
    "USABat"
   ],
   "confidence": "verified",
   "source_url": "https://www.baberuthleague.org/bat-rules",
   "source_label": "Babe Ruth League, Inc. bat rules page",
   "site_page": "/leagues/babe-ruth-cal-ripken.html",
   "notes": "Cal Ripken: USA Baseball marking, 2 5/8\" max, NO BBCOR and NO USSSA bats. Solid one-piece wood allowed (Rule 1.10). Rolling/altering voids certification.",
   "divisions": [
    {
     "id": "t-ball",
     "name": "T-Ball",
     "aliases": [
      "tee-ball",
      "tball",
      "teeball"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625
      }
     ],
     "rule": "Babe Ruth League bat rules (T-Ball): USA Baseball T-Ball stamp."
    },
    {
     "id": "cal-ripken",
     "name": "Cal Ripken (Rookie through Major/70)",
     "aliases": [
      "majors",
      "major",
      "minors",
      "rookie",
      "ripken",
      "major-70",
      "5u",
      "6u",
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625
      }
     ],
     "rule": "Babe Ruth League bat rules (Cal Ripken Baseball): USA Baseball marking, 2 5/8\" barrel maximum; NO BBCOR bats or USSSA bats."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "babe-ruth",
   "name": "Babe Ruth Baseball (13-18)",
   "short": "Babe Ruth",
   "slugs": [
    "baberuth"
   ],
   "standards": [
    "USABat",
    "BBCOR"
   ],
   "confidence": "verified",
   "source_url": "https://www.baberuthleague.org/bat-rules",
   "source_label": "Babe Ruth League, Inc. bat rules page",
   "site_page": "/leagues/babe-ruth-cal-ripken.html",
   "notes": "13-16: USA Baseball marking or BBCOR .50, 2 5/8\". 16-18: all bats must be BBCOR .50. Solid one-piece wood allowed in all divisions.",
   "divisions": [
    {
     "id": "13-16",
     "name": "Babe Ruth 13-16",
     "aliases": [
      "13-15",
      "13u",
      "14u",
      "15u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625
      }
     ],
     "rule": "Babe Ruth League bat rules (Babe Ruth Baseball 13-16): USA Baseball marking or BBCOR .50, 2 5/8\" barrel."
    },
    {
     "id": "16-18",
     "name": "Babe Ruth 16-18",
     "aliases": [
      "16u",
      "17u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625
      }
     ],
     "rule": "Babe Ruth League bat rules (Babe Ruth Baseball 16-18): all bats must be BBCOR .50 (solid one-piece wood also permitted)."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "pony",
   "name": "PONY Baseball",
   "short": "PONY",
   "slugs": [
    "pony-baseball"
   ],
   "standards": [
    "USABat",
    "BBCOR (-3)"
   ],
   "confidence": "verified",
   "source_url": "https://ponybbsb.freshdesk.com/en/support/solutions/articles/27000084520-baseball-rule-changes-for-2026-season-",
   "source_label": "PONY Rule 8-C (2026 rule changes)",
   "site_page": "/leagues/pony.html",
   "notes": "Max 2 5/8\" diameter and 42\" length in all divisions; 2 3/4\" barrels prohibited everywhere. Except the -3 BBCOR bat, all bats need the USA Baseball mark. Tee-ball bats only with Level 5 or softer safety balls.",
   "divisions": [
    {
     "id": "shetland-bronco",
     "name": "Shetland / Pinto / Mustang / Bronco",
     "aliases": [
      "shetland",
      "pinto",
      "mustang",
      "bronco",
      "5u",
      "6u",
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 42
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 42
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 42
      }
     ],
     "rule": "PONY Rule 8-C (2026): max 2 5/8\" diameter; with the exception of the -3 BBCOR-certified bat, all bats must carry the USA Baseball mark; 2 3/4\" barrels are prohibited in all divisions."
    },
    {
     "id": "pony-14u",
     "name": "Pony 14U",
     "aliases": [
      "pony",
      "13u",
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 42
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 42
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 42
      }
     ],
     "rule": "PONY Rule 8-C (2026): max 2 5/8\" diameter; with the exception of the -3 BBCOR-certified bat, all bats must carry the USA Baseball mark."
    },
    {
     "id": "colt-palomino",
     "name": "Colt 16U / Palomino 19U",
     "aliases": [
      "colt",
      "palomino",
      "15u",
      "16u",
      "17u",
      "18u",
      "19u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      }
     ],
     "rule": "PONY Rule 8-C(5) (2026): COLT 16U and PALOMINO 19U are only allowed to use 2 5/8\" -3 BBCOR-certified bats.",
     "borderline_stamps": {
      "wood": "PONY 8-C(5) says Colt/Palomino may only use -3 BBCOR bats, while 8-C also lists wooden bats as acceptable. Confirm wood with your league."
     }
    },
    {
     "id": "thorobred",
     "name": "Thorobred 23U",
     "aliases": [
      "23u"
     ],
     "options": [
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "PONY Rule 8-C(6): THOROBRED 23U must use wooden bats only, as specified by Major League Baseball."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "aabc",
   "name": "AABC (American Amateur Baseball Congress)",
   "short": "AABC",
   "slugs": [],
   "standards": [
    "USABat",
    "BBCOR",
    "wood (older divisions)"
   ],
   "confidence": "verified",
   "source_url": "https://www.usabaseball.com/bats/decertified-bats",
   "source_label": "USA Baseball (AABC listed as a USABat league) + AABC Handbook 4.09 (2018 edition, sportngin mirror)",
   "site_page": "/leagues/aabc.html",
   "notes": "Youth divisions use USABat with no drop limit, 2 5/8\" max. The only handbook we could retrieve is the 2018 edition, so the older-division rules are marked unverified.",
   "divisions": [
    {
     "id": "youth",
     "name": "Clemente / Robinson / Mays / Hodges / Reese / Ryan",
     "aliases": [
      "clemente",
      "jackie-robinson",
      "willie-mays",
      "gil-hodges",
      "pee-wee-reese",
      "nolan-ryan",
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u",
      "13u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625
      }
     ],
     "rule": "AABC Handbook 4.09(g): wood or non-wood bats, max 2 5/8\" diameter, no drop restriction; all non-wood bats must carry the USA Baseball certification stamp (since 2018)."
    },
    {
     "id": "sandy-koufax",
     "name": "Sandy Koufax (14)",
     "aliases": [
      "koufax",
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625
      }
     ],
     "rule": "AABC Handbook 4.09(f) (2018 ed.): Sandy Koufax tournaments - wood or non-wood BBCOR only, no lighter than -3, max 2 5/8\".",
     "confidence": "unverified"
    },
    {
     "id": "mantle-plus",
     "name": "Mantle / Griffey / Connie Mack / Mattingly / Musial",
     "aliases": [
      "mantle",
      "griffey",
      "connie-mack",
      "mattingly",
      "musial",
      "16u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "AABC Handbook 4.09(e) (2018 ed.): one-piece wood only in these division tournaments (max 42\", 2.61\").",
     "confidence": "unverified"
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "dixie-youth",
   "name": "Dixie Youth Baseball",
   "short": "Dixie Youth",
   "slugs": [
    "dixie",
    "dyb"
   ],
   "standards": [
    "USABat",
    "BBCOR (-3)"
   ],
   "confidence": "verified",
   "source_url": "https://rec.wytheville.org/docs/general/042326-2026-DYB-Official-Playing-Rules.pdf",
   "source_label": "2026 DYB Official Playing Rules, Rule 1.10 (league-hosted copy)",
   "site_page": "/leagues/dixie-youth.html",
   "notes": "All bats max 33\" and 2 5/8\". BPF 1.15 bats are illegal in every age division. Tee-ball-stamped bats only with low-compression balls. Dixie Boys (13+) is not covered here.",
   "divisions": [
    {
     "id": "all",
     "name": "All DYB divisions (T-Ball through Majors)",
     "aliases": [
      "t-ball",
      "tee-ball",
      "coach-pitch",
      "machine-pitch",
      "minors",
      "ozone",
      "majors",
      "aaa",
      "aa",
      "5u",
      "6u",
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_length": 33
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 33
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 33
      }
     ],
     "rule": "DYB Rule 1.10(a) (2026): max 2 5/8\" diameter and 33\" length; non-wood bats must carry the USA Baseball mark; 2 5/8\" -3 BBCOR bats allowed; all bats stamped 'BPF 1.15' are illegal."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "usssa",
   "name": "USSSA Baseball",
   "short": "USSSA",
   "slugs": [
    "usssa-baseball",
    "travel"
   ],
   "standards": [
    "USSSA 1.15 BPF",
    "USABat",
    "BBCOR"
   ],
   "confidence": "verified",
   "source_url": "https://www.usssabaseball.org/images/2026_USSSA_National_By-Laws.pdf",
   "source_label": "2026 USSSA National By-Laws Rule 7.01.C-D + usssa.com bat marks page",
   "site_page": "/leagues/usssa.html",
   "notes": "Bats must be made by an approved USSSA licensee and not be on the USSSA Withdrawn/Non-Compliant list. Any USA Baseball-stamped bat is legal in USSSA except where BBCOR is required. States and events (Elite World Series, Super NITs) can be stricter.",
   "divisions": [
    {
     "id": "12u-and-under",
     "name": "12U and younger",
     "aliases": [
      "youth",
      "5u",
      "6u",
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75
      },
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "USSSA By-Law 7.01.C (2026): 14U and younger bats must be permanently stamped with the USSSA 1.15 BPF mark, BBCOR .50, or be wood from a licensed USSSA manufacturer (big barrels up to 2 3/4\"); 7.01.D: USA Baseball-stamped bats are legal."
    },
    {
     "id": "13u",
     "name": "13U",
     "aliases": [
      "13"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 8
      },
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_drop": 8
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "USSSA By-Law 7.01.C.1 & 7.01.D (2026): all 13U players must use a bat no lighter than -8 (USSSA 1.15 or USA mark), or BBCOR / wood.",
     "notes": "Elite World Series 13 Majors are stricter (-5, BBCOR or wood only)."
    },
    {
     "id": "14u",
     "name": "14U",
     "aliases": [
      "14"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "USSSA By-Law 7.01.C (starting 1/1/2026): in 14U, -3 (BBCOR) is the National Standard - all players must use a -3 BBCOR or wood bat unless the event's state has adopted the -5 exception. Select Super NIT, Super NIT and Elite World Series: BBCOR or wood only.",
     "conditional": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 5,
       "note": "A -5 USSSA bat is only legal if this event's state has opted into the USSSA 14U -5 exception (By-Law 7.01.C.2) - never at Super NITs or the Elite World Series."
      },
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_drop": 5,
       "note": "A -5 USA bat is only legal if this event's state has opted into the USSSA 14U -5 exception - never at Super NITs or the Elite World Series."
      }
     ]
    },
    {
     "id": "15u-plus",
     "name": "15U and older / scholastic",
     "aliases": [
      "15u",
      "16u",
      "17u",
      "18u",
      "scholastic"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 36
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "usssa.com bat marks: big barrel bats 15U & above must be NFHS-approved with the BBCOR certification mark, or wood, from an approved USSSA licensee (By-Law 7.01.C.3: NFHS standard, no lighter than -3)."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "high-school",
   "name": "High School (NFHS)",
   "short": "High school (NFHS)",
   "slugs": [
    "hs",
    "nfhs",
    "highschool",
    "varsity"
   ],
   "standards": [
    "BBCOR .50"
   ],
   "confidence": "verified",
   "source_url": "https://nfhs.org/sports/baseball/rules",
   "source_label": "NFHS Baseball Rules 1-3-2 / 1-3-3 (2026; 2028 change noted)",
   "site_page": "/leagues/bbcor-nfhs.html",
   "notes": "Non-wood: BBCOR .50 (or 'USA Baseball BBCOR') permanent mark, max 2 5/8\", 36\", no lighter than -3; no stickers/decals. One-piece wood: max 2 3/4\", 36\". From Jan 1, 2028 NFHS also allows bats marked 'USA Baseball -4/-5/-6'. State associations follow NFHS.",
   "divisions": [
    {
     "id": "varsity-jv",
     "name": "Varsity / JV / Freshman",
     "aliases": [
      "varsity",
      "jv",
      "freshman",
      "hs",
      "15u",
      "16u",
      "17u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 36
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75,
       "max_length": 36
      }
     ],
     "rule": "NFHS Rule 1-3-2: non-wood bats must meet BBCOR .50 with a permanent 'BBCOR .50' mark, be 2 5/8\" or less in diameter and 36\" or less, and weigh no more than 3 oz less than their length (-3). Rule 1-3-3: one-piece wood max 2 3/4\"."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "college",
   "name": "College (NCAA)",
   "short": "NCAA",
   "slugs": [
    "ncaa"
   ],
   "standards": [
    "BBCOR .50"
   ],
   "confidence": "verified",
   "source_url": "https://ncaaorg.s3.amazonaws.com/championships/sports/baseball/rules/PRMBA_RulesBook.pdf",
   "source_label": "NCAA Baseball Rules 1-12",
   "site_page": "/leagues/bbcor-nfhs.html",
   "notes": "Non-wood: max 36\", 2 5/8\", -3, approved coded certification mark; wood max 2 3/4\", 42\".",
   "divisions": [
    {
     "id": "ncaa",
     "name": "NCAA",
     "aliases": [
      "college",
      "d1",
      "d2",
      "d3"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 36
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75,
       "max_length": 42
      }
     ],
     "rule": "NCAA Rule 1-12-b: non-wood bats max 36\" long and 2 5/8\" diameter, no more than 3 units lighter than length (-3), with an approved certification mark; 1-12-a: wood max 2 3/4\", 42\"."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "american-legion",
   "name": "American Legion Baseball",
   "short": "American Legion",
   "slugs": [
    "legion"
   ],
   "standards": [
    "BBCOR"
   ],
   "confidence": "verified",
   "source_url": "https://www.legion.org/getmedia/7d390fd4-650e-4e60-b534-85681100c2c0/39ACY1225-Baseball-Rule-Book-Senior.pdf",
   "source_label": "American Legion Baseball Rule Book (Senior, 2026)",
   "site_page": "/leagues/american-legion.html",
   "notes": "Senior rule book: non-wood bats must be BBCOR-certified with a permanent mark, max 36\" and 2 5/8\"; wood max 2 3/4\" and 42\". Some state departments require wood - check your state.",
   "divisions": [
    {
     "id": "senior-junior",
     "name": "Senior / Junior Legion",
     "aliases": [
      "senior",
      "junior",
      "legion"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 36
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75,
       "max_length": 42
      }
     ],
     "rule": "American Legion Baseball rules (Senior): non-wood bats must carry the BBCOR certification mark, be no longer than 36\" and no wider than 2 5/8\"; wood bats up to 2 3/4\" and 42\"."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "aau",
   "name": "AAU Baseball (national championships)",
   "short": "AAU",
   "slugs": [],
   "standards": [
    "Event-defined (13U and younger)",
    "BBCOR (14U+)"
   ],
   "confidence": "verified",
   "source_url": "https://www.aausports.org/baseball/bat-rules-age-cutoff/",
   "source_label": "AAU Baseball bat rules page",
   "site_page": "/leagues/aau.html",
   "notes": "AAU national page: 13U and younger 'no restrictions'; 14U and older BBCOR drop 3. District and event rules can be stricter.",
   "divisions": [
    {
     "id": "13u-under",
     "name": "13U and younger",
     "aliases": [
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u",
      "13u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ]
      }
     ],
     "rule": "AAU Baseball bat rules: 13U and younger - no restrictions (national championship wording)."
    },
    {
     "id": "14u-plus",
     "name": "14U and older",
     "aliases": [
      "14u",
      "15u",
      "16u",
      "17u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      }
     ],
     "rule": "AAU Baseball bat rules: 14U and older - BBCOR drop 3.",
     "borderline_stamps": {
      "wood": "AAU's page only says 'BBCOR drop 3' for 14U+. Wood is usually allowed - confirm with the event."
     }
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "mbl",
   "name": "MBL - Metro Baseball League (Twin Cities, MN)",
   "short": "MBL",
   "slugs": [
    "metro-baseball-league",
    "mbt"
   ],
   "standards": [
    "USABat",
    "USSSA 1.15",
    "BBCOR"
   ],
   "confidence": "verified",
   "source_url": "https://www.mbl.bz/pages/faq-bats",
   "source_label": "MBL Bat Rules (mbl.bz)",
   "site_page": "/leagues/mbl.html",
   "notes": "9-14U bats need a USA Baseball, USSSA or BBCOR stamp AND must meet the barrel/drop table. Part-wood/part-composite bats need a stamp. Bats declared illegal by the manufacturer or governing body (e.g. USSSA) are illegal in MBL.",
   "divisions": [
    {
     "id": "9u-11u",
     "name": "9U-11U",
     "aliases": [
      "9u",
      "10u",
      "11u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor"
       ],
       "max_barrel": 2.75
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "MBL Bat Rules: 9-11U barrel 2 3/4\" or less, weight differential unlimited; stamp USA Baseball, USSSA or BBCOR."
    },
    {
     "id": "12u-13u",
     "name": "12U & 13U",
     "aliases": [
      "12u",
      "13u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor"
       ],
       "max_barrel": 2.25,
       "label": "small barrel"
      },
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor"
       ],
       "max_barrel": 2.75,
       "max_drop": 10,
       "label": "big barrel"
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "MBL Bat Rules: 12U & 13U - barrel 2 1/4\" or less with unlimited weight differential, OR barrel 2 3/4\" or less with weight differential -10 or less."
    },
    {
     "id": "14u-15a",
     "name": "14U & 14/15A",
     "aliases": [
      "14u",
      "15a",
      "14-15a"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor"
       ],
       "max_barrel": 2.75,
       "max_drop": 5
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "MBL Bat Rules: 14U & 14/15A - barrel 2 3/4\" or less, weight differential -5 or less."
    },
    {
     "id": "15aa-15aaa",
     "name": "15AA & 15AAA",
     "aliases": [
      "15aa",
      "15aaa",
      "15u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "MBL Bat Rules: 15AA and 15AAA must use a -3 BBCOR-stamped bat or a single-piece wood bat."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "gopher-state",
   "name": "MYAS / Gopher State Baseball (MN)",
   "short": "MYAS / Gopher State",
   "slugs": [
    "myas",
    "gopher",
    "gsbl",
    "north-star"
   ],
   "standards": [
    "USSSA (USA also legal)",
    "BBCOR 15U+"
   ],
   "confidence": "verified",
   "source_url": "https://myas.org/bat-standards",
   "source_label": "MYAS / Gopher State Bat Standards (2026 season)",
   "site_page": "/leagues/gopher-state.html",
   "notes": "Gopher State Baseball League uses the USSSA bat standard for 2026; USA bats are also legal. The age chart applies in addition to the stamp requirement.",
   "divisions": [
    {
     "id": "9u-11u",
     "name": "9U-11U",
     "aliases": [
      "9u",
      "10u",
      "11u"
     ],
     "options": [
      {
       "stamps": [
        "usssa",
        "usa",
        "bbcor"
       ],
       "max_barrel": 2.75
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "MYAS/Gopher State bat guidelines: 9U-11U max 2 3/4\", length and weight differential unlimited; USSSA or USA mark, qualified BBCOR, or wood."
    },
    {
     "id": "12u-13u",
     "name": "12U-13U",
     "aliases": [
      "12u",
      "13u"
     ],
     "options": [
      {
       "stamps": [
        "usssa",
        "usa",
        "bbcor"
       ],
       "max_barrel": 2.25,
       "label": "small barrel"
      },
      {
       "stamps": [
        "usssa",
        "usa",
        "bbcor"
       ],
       "max_barrel": 2.75,
       "max_drop": 10,
       "max_length": 36,
       "label": "big barrel"
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75,
       "max_length": 36
      }
     ],
     "rule": "MYAS/Gopher State bat guidelines: 12U-13U - 2 1/4\" barrel unlimited; 2 1/2\" to 2 3/4\" barrels max 36\" and -10 (a 31\" bat cannot weigh less than 21 oz)."
    },
    {
     "id": "14u-15a",
     "name": "14U / 14-15A",
     "aliases": [
      "14u",
      "15a"
     ],
     "options": [
      {
       "stamps": [
        "usssa",
        "usa",
        "bbcor"
       ],
       "max_barrel": 2.75,
       "max_drop": 5,
       "max_length": 36
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75,
       "max_length": 36
      }
     ],
     "rule": "MYAS/Gopher State bat guidelines: 14U - 14/15A max 2 3/4\", 36\" or less, -5 (a 32\" bat cannot weigh less than 27 oz)."
    },
    {
     "id": "15u-19u",
     "name": "15U-19U",
     "aliases": [
      "15u",
      "16u",
      "17u",
      "18u",
      "19u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3,
       "max_length": 36
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.625,
       "max_length": 36
      }
     ],
     "rule": "MYAS/Gopher State bat guidelines: 15U-19U max 2 5/8\", 36\" or less, -3; non-wood must be BBCOR (NFHS Rule 1-3-2)."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "gcbl",
   "name": "GCBL - Greater Chicagoland Baseball League",
   "short": "GCBL",
   "slugs": [
    "greater-chicagoland"
   ],
   "standards": [
    "USABat",
    "USSSA 1.15",
    "BBCOR"
   ],
   "confidence": "verified",
   "source_url": "https://www.gcbleague.org/page/show/2828341-gcbl-rules-and-regulations",
   "source_label": "GCBL Rules 2027 - Legal Bats",
   "site_page": "/leagues/gcbl.html",
   "notes": "Legal bats are permanently marked 1.15 BPF, USA, USSSA, BBCOR, or wood. GCBL publishes no barrel cap, so the barrel follows the stamp standard.",
   "divisions": [
    {
     "id": "8u-12u",
     "name": "8U-12U",
     "aliases": [
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "GCBL Rules 2027 (Legal Bats): bats must be permanently marked 1.15 BPF, USA, USSSA, BBCOR, or be a wood bat."
    },
    {
     "id": "13u",
     "name": "13U",
     "aliases": [
      "13u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_drop": 8
      },
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 8
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "GCBL Rules 2027 (Legal Bats): beginning at 13U bats may be no lighter than -8."
    },
    {
     "id": "14u",
     "name": "14U",
     "aliases": [
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625,
       "max_drop": 6,
       "label": "USA -4/-5/-6"
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 5,
       "label": "USSSA -5 (2027 season only)"
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "GCBL Rules 2027 (Legal Bats): beginning at 14U bats must be USA certified -4, -5 or -6, or BBCOR; for the 2027 season only, USSSA -5 bats are also allowed at 14U."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "kvbsa",
   "name": "KVBSA - Kensington Valley Baseball & Softball (MI)",
   "short": "KVBSA",
   "slugs": [
    "kensington-valley"
   ],
   "standards": [
    "USSSA (8U-14U)",
    "NFHS/BBCOR (15U-18U)"
   ],
   "confidence": "verified",
   "source_url": "https://kvbsa.com/BatGuidelines.html",
   "source_label": "KVBSA Bat Guidelines page (undated)",
   "site_page": "/leagues/kvbsa.html",
   "notes": "8U-14U follow USSSA standards (USSSA 1.15, BBCOR, wood; USA Baseball bats allowed). 15U-18U follow NFHS. 13U/14U drop caps come from the annual rules PDF, which we have not verified.",
   "divisions": [
    {
     "id": "8u-12u",
     "name": "8U-12U",
     "aliases": [
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75
      },
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "KVBSA Bat Guidelines: for 8U through 14U KVBSA follows USSSA standards (USSSA 1.15 BPF stamp, BBCOR or wood); USA Baseball bats are also allowed."
    },
    {
     "id": "13u-14u",
     "name": "13U-14U",
     "aliases": [
      "13u",
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75
      },
      {
       "stamps": [
        "usa"
       ],
       "max_barrel": 2.625
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "KVBSA Bat Guidelines: 8U-14U follow USSSA standards; age drop caps (e.g. 13U -8) are set in the annual rules PDF.",
     "confidence": "unverified"
    },
    {
     "id": "15u-18u",
     "name": "15U-18U",
     "aliases": [
      "15u",
      "16u",
      "17u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "KVBSA Bat Guidelines: for 15U through 18U KVBSA follows NFHS (non-wood must be BBCOR)."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "bullpen",
   "name": "Bullpen Tournaments (Grand Park, IN)",
   "short": "Bullpen",
   "slugs": [
    "bullpen-grand-park",
    "grand-park"
   ],
   "standards": [
    "BPF 1.15",
    "BBCOR"
   ],
   "confidence": "verified",
   "source_url": "https://www.bullpentournaments.com/baseball-rules",
   "source_label": "Bullpen Tournaments Baseball Rules - Bat Restrictions / Banned Bats",
   "site_page": "/leagues/bullpen-grand-park.html",
   "notes": "Event pages can tighten rules. Bullpen keeps its own banned-bat list (older models).",
   "divisions": [
    {
     "id": "7u-12u",
     "name": "7U-12U",
     "aliases": [
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 12
      }
     ],
     "rule": "Bullpen Baseball Rules (7U-12U): metal/composite bats must have a branding, label or stamp proving BPF 1.15; -12, -10, -8, -5 acceptable.",
     "borderline_stamps": {
      "usa": "Bullpen's 7U-12U rule only names the BPF 1.15 stamp. USA Baseball bats are lower-performing and often accepted at USSSA-style events, but confirm with the director.",
      "wood": "Bullpen's 7U-12U rule only lists metal/composite BPF 1.15 bats. Confirm wood with the director."
     }
    },
    {
     "id": "13u-d1",
     "name": "13U D1",
     "aliases": [
      "13u-d1"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 5
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      }
     ],
     "rule": "Bullpen Baseball Rules (13U): BPF 1.15 or BBCOR; 13U D1 divisions -5 or -3."
    },
    {
     "id": "13u-d2-open",
     "name": "13U D2 / D3 / Open",
     "aliases": [
      "13u",
      "13u-d2",
      "13u-d3",
      "13u-open"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 8
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      }
     ],
     "rule": "Bullpen Baseball Rules (13U): BPF 1.15 or BBCOR; 13U D2/D3/Open divisions -8, -5, -3."
    },
    {
     "id": "14u-d1",
     "name": "14U D1",
     "aliases": [
      "14u-d1"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      }
     ],
     "rule": "Bullpen Baseball Rules (14U): 14U D1 divisions -3 (BBCOR)."
    },
    {
     "id": "14u-d2-open",
     "name": "14U D2 / D3 / Open",
     "aliases": [
      "14u",
      "14u-d2",
      "14u-d3",
      "14u-open"
     ],
     "options": [
      {
       "stamps": [
        "usssa"
       ],
       "max_barrel": 2.75,
       "max_drop": 5
      },
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      }
     ],
     "rule": "Bullpen Baseball Rules (14U): BPF 1.15 or BBCOR; 14U D2/D3/Open divisions -5, -3."
    },
    {
     "id": "15u-18u",
     "name": "15U-18U",
     "aliases": [
      "15u",
      "16u",
      "17u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "Bullpen Baseball Rules (15U-18U): -3 BBCOR-stamped metal/composite or single-piece wood."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "bbsa",
   "name": "BBSA - Bloomingdale Baseball & Softball Association (IL)",
   "short": "BBSA",
   "slugs": [
    "bloomingdale"
   ],
   "standards": [
    "Not published (corridor pattern: USA and/or USSSA)"
   ],
   "confidence": "unverified",
   "source_url": "https://www.thebbsa.org/",
   "source_label": "thebbsa.org (no public bat-stamp rule found)",
   "site_page": "/leagues/bbsa.html",
   "notes": "No current BBSA bat bylaw is published. Neighboring DuPage programs (RMSBO, CSYBA towns) commonly allow USA Baseball and/or USSSA by division. Ask your division director.",
   "divisions": [
    {
     "id": "in-house",
     "name": "In-house (all ages)",
     "aliases": [
      "house",
      "rec"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "wood"
       ]
      }
     ],
     "rule": "BBSA has not published a bat rule; the corridor pattern is USA Baseball and/or USSSA 1.15 depending on division and season."
    },
    {
     "id": "travel",
     "name": "Travel (Bulldogs)",
     "aliases": [
      "bulldogs"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ]
      }
     ],
     "rule": "BBSA travel teams follow their league/event rules (often USSSA or GCBL/WSBL-style)."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "csyba",
   "name": "CSYBA - Chicago Suburban Youth Baseball (IL)",
   "short": "CSYBA",
   "slugs": [
    "chicago-suburban"
   ],
   "standards": [
    "USA + USSSA (house, Fall 2026 / Spring 2027 notice)"
   ],
   "confidence": "unverified",
   "source_url": "https://www.csyba.com/",
   "source_label": "csyba.com homepage notice (division pages conflict)",
   "site_page": "/leagues/csyba.html",
   "notes": "CSYBA's homepage says USA Baseball and USSSA bats will be allowed at all house levels starting Fall 2026 / Spring 2027, but older division pages still ban USSSA. Confirm with your town contact.",
   "divisions": [
    {
     "id": "house",
     "name": "House league (all levels)",
     "aliases": [
      "in-house",
      "rec"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "wood"
       ]
      }
     ],
     "rule": "CSYBA homepage notice: beginning Fall 2026 / Spring 2027, USA Baseball and USSSA bats allowed at all house levels (division pages not yet updated)."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "rmsbo",
   "name": "RMSBO - Roselle Medinah (IL)",
   "short": "RMSBO",
   "slugs": [
    "roselle",
    "medinah"
   ],
   "standards": [
    "Not published (corridor pattern)"
   ],
   "confidence": "unverified",
   "source_url": "https://www.rmsbo.org/",
   "source_label": "rmsbo.org (no public bat table found)",
   "site_page": "/leagues/rmsbo.html",
   "notes": "Intervillage rule books in this corridor have allowed USA, USSSA 1.15 or wood with 2 1/4\" caps at younger ages. Confirm the season packet.",
   "divisions": [
    {
     "id": "in-house",
     "name": "In-house / intervillage",
     "aliases": [
      "house",
      "rec"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "wood"
       ]
      }
     ],
     "rule": "RMSBO has not published a current bat rule; corridor pattern only."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "wsbl",
   "name": "WSBL - West Suburban Baseball League (IL)",
   "short": "WSBL",
   "slugs": [
    "west-suburban"
   ],
   "standards": [
    "USA / USSSA 1.15 / BBCOR / wood (2024 packet)"
   ],
   "confidence": "unverified",
   "source_url": "https://www.wsbl.org/",
   "source_label": "WSBL rules packet (2024; current season not public)",
   "site_page": "/leagues/wsbl.html",
   "notes": "2024 WSBL packets allowed BBCOR, wood, BPF 1.15 or USA Baseball; BESR illegal; -8 at 13U and -5 at 14U. Current season PDF not public.",
   "divisions": [
    {
     "id": "8u-12u",
     "name": "8U-12U",
     "aliases": [
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ]
      }
     ],
     "rule": "WSBL 2024 packet: bats must be BBCOR, wood, or stamped BPF 1.15 (USSSA) or USA Baseball."
    },
    {
     "id": "13u",
     "name": "13U",
     "aliases": [
      "13u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ],
       "max_drop": 8
      }
     ],
     "rule": "WSBL 2024 packet: 13U drop limit -8."
    },
    {
     "id": "14u",
     "name": "14U",
     "aliases": [
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ],
       "max_drop": 5
      }
     ],
     "rule": "WSBL 2024 packet: 14U drop limit -5."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "msbl",
   "name": "MSBL - Mid Suburban Baseball League (IL youth travel)",
   "short": "MSBL",
   "slugs": [
    "msbl-mid-suburban",
    "mid-suburban"
   ],
   "standards": [
    "USA / USSSA / BBCOR / wood (pattern)"
   ],
   "confidence": "unverified",
   "source_url": "https://www.msbleague.org/",
   "source_label": "msbleague.org (current rules PDF not public)",
   "site_page": "/leagues/msbl-mid-suburban.html",
   "notes": "Youth travel league ages 8-14 (not the adult Men's Senior Baseball League). Drop caps are in the annual PDF.",
   "divisions": [
    {
     "id": "8u-14u",
     "name": "8U-14U",
     "aliases": [
      "8u",
      "9u",
      "10u",
      "11u",
      "12u",
      "13u",
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ]
      }
     ],
     "rule": "MSBL youth travel: stamp-family pattern only (USA, USSSA 1.15, BBCOR, wood); drop caps are in the annual PDF."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "dfw-interlock",
   "name": "DFW Interlock (North Texas)",
   "short": "DFW Interlock",
   "slugs": [
    "interlock"
   ],
   "standards": [
    "USSSA 1.15 or USA; BBCOR/wood"
   ],
   "confidence": "unverified",
   "source_url": "https://www.dfwinterlock.com/",
   "source_label": "DFW Interlock 13U/14U rules PDF (Fall 2025, not re-verified)",
   "site_page": "/leagues/dfw-interlock.html",
   "notes": "Recent 13U/14U Interlock rules: USSSA 1.15 BPF or USA Baseball stamp; BBCOR and wood allowed; 14U max -5. Younger divisions publish their own sheets.",
   "divisions": [
    {
     "id": "12u-under",
     "name": "12U and younger",
     "aliases": [
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ]
      }
     ],
     "rule": "DFW Interlock: younger divisions publish their own packets (often USA/USSSA dual)."
    },
    {
     "id": "13u-14u",
     "name": "13U-14U",
     "aliases": [
      "13u",
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ],
       "max_drop": 5
      }
     ],
     "rule": "DFW Interlock 13U/14U rules (Fall 2025): USSSA 1.15 BPF or USA Baseball stamp; BBCOR and wood allowed; 14U max -5."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "nctb",
   "name": "NCTB - Northern California Tournament Baseball",
   "short": "NCTB",
   "slugs": [],
   "standards": [
    "USSSA 1.15 / BBCOR / wood (14U AA & under)",
    "BBCOR -3 (14U Open+)"
   ],
   "confidence": "unverified",
   "source_url": "https://www.playnctb.com/",
   "source_label": "NCTB Baseball Rulebook (not re-verified this season)",
   "site_page": "/leagues/nctb.html",
   "notes": "Classification (AA vs Open) changes the bat. Many 15U-18U events are wood only.",
   "divisions": [
    {
     "id": "14u-aa-under",
     "name": "14U AA and younger",
     "aliases": [
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u",
      "13u",
      "14u-aa"
     ],
     "options": [
      {
       "stamps": [
        "usssa",
        "bbcor",
        "wood"
       ]
      }
     ],
     "rule": "NCTB rulebook: 14U AA and younger - permanent 1.15 BPF mark, BBCOR .50, or wood."
    },
    {
     "id": "14u-open-plus",
     "name": "14U Open / Major / AAA and older",
     "aliases": [
      "14u-open",
      "14u",
      "15u",
      "16u",
      "17u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "NCTB rulebook: 14U Open and older - BBCOR -3 or wood (many 15U-18U events are wood only)."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "dizzy-dean",
   "name": "Dizzy Dean Baseball",
   "short": "Dizzy Dean",
   "slugs": [
    "dizzydean"
   ],
   "standards": [
    "USA / BPF 1.15 / BBCOR (5-12)",
    "BBCOR (13-19)"
   ],
   "confidence": "unverified",
   "source_url": "https://www.dizzydeanbbinc.org/",
   "source_label": "2025 Dizzy Dean Baseball Rules PDF (not re-verified)",
   "site_page": "/leagues/dizzy-dean.html",
   "notes": "Common Rule 2:07 (2025): ages 5-12 allow 2 1/4\", 2 5/8\" or 2 3/4\" if properly stamped USA, BPF 1.15 or BBCOR; ages 13-19 BBCOR -3.",
   "divisions": [
    {
     "id": "5-12",
     "name": "Ages 5-12",
     "aliases": [
      "5u",
      "6u",
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u"
     ],
     "options": [
      {
       "stamps": [
        "usa",
        "usssa",
        "bbcor",
        "wood"
       ],
       "max_barrel": 2.75
      }
     ],
     "rule": "Dizzy Dean Common Rule 2:07 (2025): 2 1/4\", 2 5/8\" or 2 3/4\" barrels if properly stamped USA, BPF 1.15 or BBCOR."
    },
    {
     "id": "13-19",
     "name": "Ages 13-19",
     "aliases": [
      "13u",
      "14u",
      "15u",
      "16u",
      "17u",
      "18u",
      "19u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "Dizzy Dean Common Rule 2:07 (2025): ages 13-19 BBCOR -3 for non-wood."
    }
   ],
   "date_checked": "2026-10-24"
  },
  {
   "id": "perfect-game",
   "name": "Perfect Game events",
   "short": "Perfect Game",
   "slugs": [
    "pg"
   ],
   "standards": [
    "Event-specific"
   ],
   "confidence": "unverified",
   "source_url": "https://www.perfectgame.org/",
   "source_label": "Perfect Game event pages (rules set per event)",
   "site_page": "/leagues/perfect-game.html",
   "notes": "PG directors set bat rules per event (stamp, drop, barrel). Open the event's Rules tab.",
   "divisions": [
    {
     "id": "14u-under",
     "name": "14U and younger",
     "aliases": [
      "7u",
      "8u",
      "9u",
      "10u",
      "11u",
      "12u",
      "13u",
      "14u"
     ],
     "options": [
      {
       "stamps": [
        "usssa",
        "usa",
        "bbcor",
        "wood"
       ]
      }
     ],
     "rule": "Perfect Game: each event tab sets the bat rule; 14U and younger commonly USSSA/USA/BBCOR/wood."
    },
    {
     "id": "15u-plus",
     "name": "15U and older",
     "aliases": [
      "15u",
      "16u",
      "17u",
      "18u"
     ],
     "options": [
      {
       "stamps": [
        "bbcor"
       ],
       "max_barrel": 2.625,
       "max_drop": 3
      },
      {
       "stamps": [
        "wood"
       ]
      }
     ],
     "rule": "Perfect Game: 15U+ events commonly BBCOR -3 or wood (many wood-only)."
    }
   ],
   "date_checked": "2026-10-24"
  }
 ]
}