Specially designed for Heater(R) pitching machines, the 11'' Power Alley Lite Softballs are made of durable polyurethane and pitch with pinpoint accuracy. Product Features: Durable polyurethane construction built Heater(R) Lite Softball and Combo Pitching Machine Dual wheel variable speed control and adjustable height for multiple pitch types Additional Details: Size: 11'' Balls included: 6 One-year manufacturer parts and labor warranty 30-Day Money Back Guarantee