Rules per Adult leagues (MSBL/MABL national tournaments) official rules. View the source (verified July 4, 2026).
Adult leagues (MSBL/MABL national tournaments) Adult (18+) requires a bat marked Solid one-piece wood. Typically ages 18-99.
Scope: MSBL/MABL NATIONAL TOURNAMENT play only (the citation is explicitly tournament rules): all divisions are wood bat only; composite- and metal-wood bats also permissible in wood-only divisions, but only solid one-piece wood maps to the v1 cert vocabulary. Local MSBL league bat rules vary (many allow metal) — confirm locally. NABA is deliberately not covered by this org; see _meta.scope_cuts.
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