Marucci's Cal Ripken Limited Edition Baseball Bat 28/18 AZ3000 one piece alloy perfect for spring, summer or fall baseball Ultra-tacky grip with Unequal Kevlar reinforcement has better grip and reduced vibration 2 3/4" barrel diameter gives you the perfect sweet spot with optimal bat speed Maximum weight drop for improved swing speed so you can hit more Home Runs Certification: USSSA 1.15 BPF, Little League, Babe Ruth Baseball, Dixie Youth Baseball, Pony Baseball, AABC