Built for exceptional performance and durability, the Dudley(R) 12'' NFHS(R)/USA(R) Thunder Heat(R) Fastpitch Softballs utilize a premium leather cover with a precision blended, cross-linked polyurethane system to deliver precise throws and pitches for top-level athletes. Product Features: Size: 12" Cover: Leather Center: Precision blended cross-linked polyurethane system Rating: .47 COR Compression: 375 lbs. League(s)/Association(s): USA (Formerly ASA(R))/NFHS(R) Maintains a steady compression in both high and low temperatures Additional Details: Includes 6 softballs