Utilizing Miken"s top grade carbon fiber and specific handle flex this bat gives you maximum swing speed and distance * Bat Specifications Drop: -12.5 Fastpitch Certification: USSSA Certified for Play 2013 and Beyond, ASA, NSA, NCAA and NHFS Available Sizes: 28in 15.5oz,29in 16.5oz,30in 17.5oz,31in 18.5oz,32in 19.5oz,33in 20.5oz