AZ105 ALLOY, the strongest ALUMINUM on the Mariucci bat line, allows for THINNER BARREL walls, a higher RESPONSE rate and better DURABILITY Multi-variable wall design creates an EXPANDED SWEET SPOT and thinner BARREL walls that are more forgiving after off-centered contact Second-generation AV2 ANTI-VIBRATION KNOB features an upgraded, finely tuned harmonic dampening system for better feel and less negative VIBRATIONAL feedback Approved for play in AABC Baseball, Babe Ruth & Cal Ripken Baseball, Dixie Youth Baseball, Dixie Boys Baseball, Little League, Pony Baseball and NABF Baseball