Mizuno Black Widow Fastpitch Bat (-10) 5Z Technology adjusts the composite layers across five separate locations to expand the sweet spot giving higher exit speeds across the entire barrel 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 Cylinder seaming eliminates edge inconsistencies between carbon layers for consistent high performance with improved durability across the entire barrel Approved for play in all associations: ASA, USSSA, NSA, ISA & ISF