PMB39 Size: 12" Features: -Pitching machine. -Material: Durable polyurethane for extended ball life. -Softball design. -Recommended ball for heater combo brand pitching machines. Item: -Balls. Generic Dimensions: -11": 3.66" H x 3.66" W x 3.66" D, 5.2 lbs. -12": 4" H x 4" W x 4" D, 5.6 lbs.