USA Baseball Bats consist of youth bats with a length to weight ration from -5, -8, -9, -10, -11, -12, and -13. These bats can have a barrel no larger than 2 5/8 in diameter and go down to a 2 1/4 in diameter. Many youth leagues including but not limited too AABC, Babe Ruth, Cal Ripken, Dixie, Little League, and Pony mandate using a bat stamped with the USA Baseball certification logo. Need help finding a bat? Give us a call at 1-800-997-4233 and we will make sure you get the service you deserve in your bat purchasing process.