The bat must be a baseball bat which meets Little League specifications and standards as noted in this rule. It shall be a smooth, rounded stick and made of wood or of material and color tested and proved acceptable to Little League standards.
Little League (Majors) and below: it shall not be more than thirty-three (33) inches in length nor more than two and one-quarter (2¼) inches in diameter. Non-wood bats shall be labeled with a BPF (bat performance factor) of 1.15 or less.

EXCEPTION: For the 2011-2012 Little League (Majors) and below, for regular season play and Tournament, composite bats are prohibited unless approved by Little League International. A list of approved and licensed composite bats can be found on the Little League website at www.littleleague.org.