The Heater(R) Pitching Machine Baseballs are designed to pitch with pinpoint accuracy when used with the Heater Combo, Pro, 4-in-1, and Junior pitching machines. Perfectly molded at the factory, Heater baseballs are the world's most accurate pitching machine baseballs. This dozen of Heater(R) Pitching Machine Baseballs is recommended for ages 8 and up and includes a 30-day manufacturer's money-back guarantee. FEATURES: Pitching machine baseballs for hitting training Recommended ball for most Heater(R) brand pitching machines Made from durable polyurethane for extended ball life Designed to release with pinpoint accuracy out of the machine//LI> Recommended for ages 8 and up Includes 12 pitching machine baseballs per purchase 30-day manufacturer's money-back guarantee Model: HTR29PMB