Heater real bowling machine balls are specifically designed for Heater Real Bowling Machines. These balls are optic yellow in color, made from durable polyurethane, and pitch with pin point accuracy. Perfectly molded at the factory, Heater balls are the world's most accurate cricket balls.. FEATURES & BENEFITS: Recommended ball for Heater real bowling machines Made from durable polyurethane for extended ball life Recommended Ages: 8 years to Adult 1 Dozen 9 In. Optic Yellow Dimpled Cricket Balls Regulation Weighted Cricket Balls Great For Perfecting Hand-Eye Coordination Use For Bowling and Batsman Practice