Mizuno Silhouette Softball Bat New x-zone Technology adjust composite angles into 10 specific zones to expand the sweet spot and create higher exit speeds across the barrel Double wall Technology provides thinner walls with added durability. Allows for higher peak performance out of the wrapper and larger sweet spot One piece composite with black Array carbon. Mizuno's own high end composite pre-preg allows for shorter break in period to maximum performance Reinforced taper with Anti-shock construction added layers in taper improve durability while also absorbing vibrations 30 day performance guarantee. Approved for play in all associations: ASA, USSSA, NSA, ISA & ISF