Can you use a wood bat in Little League, USSSA or high school?

Yes: solid one-piece wood is legal everywhere without a mark. A multi-piece, laminated or composite wood bat needs the mark your league names.

The rule

Solid one-piece wood is legal everywhere without a mark; multi-piece or laminated wood needs the league's mark.

Where this comes from

Every rule, with its source, is on How the fit works.

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