Introducing the Mizuno CRBN X Fastpitch Softball Bat - our first-ever one-piece Detonator Cor™ design, redefining peak performance on the field. Double Wall: Gives you higher peak performance right out of the wrapper with a larger sweet spot for more power and forgiveness. Cylinder Seaming: Allows for consistent performance and durability across the barrel. One-Piece Construction: For maximum mobility and comfort. Speed-Helix Grip: Designed to provide comfort and durability. One Year Warranty: Warranted from defects in materials and workmanship for a period of one year from the date of purchase. ASA Approved : Approved for ASA play. USSSA Approved: Approved for USSSA play. NSA Approved: Approved for NSA play. ISA Approved: Approved for ISA play. WBSC/ISF Approved: Approved for WBSC or ISF play. Detonator Cor™: Mizuno's patented design creates low barrel compression for great performance, while improving impact sound. Black Onyx Carbon™: Increased durability with a shorter break-in period.