The Dudley(R) 11'' USA (formerly ASA(R)) Thunder Heat(R) Fastpitch Softball is constructed with a Poly Core Material and covered with a durable composite material, promoting optimal game day performance when throwing on the mound or stepping up to home plate. Product Features: Size: 11" Cover: Composite Center: Poly-Core Rating: .47 COR Seams: Raised League(s)/Association(s): USA/ASA(R) Softball Maintains a steady compression in both high and low temperatures Additional Details: Includes 6 softballs