Mizuno Mamba Slow Pitch Softball Bat (ASA) NEW Double Wall Technology provides thinner walls with added durability, allows for higher peak performance out of the wrapper and larger sweet spot New lighter weight coiled end cap for optimal MOI ideal for the balanced swing weight Black Array Carbon Mizuno's own high end composite pre-preg allows for Shorter break in period to maximum performance 13 inch barrel Approved for play in: ASA, USSSA, NSA, ISA & IS