New Heater Sports Heavy Duty Baseball Pitching Machine with Bonus Ball Feeder One Size:Red black White The Knee Strap stays securely Navy Violet The Knee Strap stays securely in position during activities and the compression can be adjusted to individual needs and is tightened evenly on both sides fast drying fabric for superior performance Material wicks sweat & dries really fast Anti odor technology prevents the growth of odor causing microbes New PITCHES LITE BASEBALLS UP TO 80 MPH Use Heater Sports Lite Baseballs To Vary The Pitch Speed From 20 80 MPH PITCHES REAL BASEBALLS UP TO 52 MPH The Heater Heavy Duty Baseball Machine Consists of a 0 10 Speed Control To Adjust Real Ball Pitches From 10 52 MPH