Rule 1.10
The bat must be a baseball bat which meets the USA Baseball Bat standard (USABat) as adopted by Little League. It shall be a smooth, rounded stick, and made of wood or of material and color tested and proved acceptable to the USA Baseball Bat standard (USABat).
Non-wood and laminated bats used in the Little League (Majors) and below, Intermediate (50-70) Division, and Junior League divisions, shall bear the USA Baseball logo signifying that the bat meets the USABat – USA Baseball’s Youth Bat Performance Standard. All BPF – 1.15 bats are prohibited. The bat diameter shall not exceed 2⅝ inches for these divisions of play. Bats meeting the Batted Ball Coefficient of Restitution (BBCOR) standard may also be used in the Intermediate (50-70) Division and Junior League Division. Additional information is available at LittleLeague.org/batinfo.
Tee Ball:
Under the USABat standard, certified Tee Ball bats (26″ and shorter) will feature the USA Baseball mark and text which reads ONLY FOR USE WITH APPROVED TEE BALLS. NOTE: Approved Tee Ball bats may also be used for Coach Pitch/Machine Pitch Divisions only with the use of approved Tee Balls.
Lower & Upper Major Divisions:
Bat shall not be more than 33 inches in length; nor more than 2⅝ inches in diameter, and if wood, not less than fifteen-sixteenths (15/16) inches in diameter (7/8 inch for bats less than 30″) at its smallest part. Wood bats taped or fitted with a sleeve may not exceed sixteen (16) inches from the small end. NOTE: Solid one-piece wood barrel bats do not require a USA Baseball logo.