Developed with a Hycon Poly-Core center and synthetic leather cover, the Dudley(R) 12'' ASA Thunder SY Softballs are primed for consistent performance no matter what the conditions are outdoors. Product Features: Size: 12" Cover: Synthetic Leather Center: Hycon Poly-Core Seams: Flat COR: 0.52 Compression: 300 lbs. League(s)/Association(s): ASA(R) Maintains a steady compression in both high and low temperatures Additional Details: Includes 6 softballs