Designed with heavy-duty Kevlar(R) seams, the Heater(R) Leather Pitching Machine Baseballs provide a realistic feel and outstanding durability. These top-grain leather pitching machine balls are the same size of a regulation baseball and give players an accurate game-day simulation. The PMBL44 Baseballs can be used with most Heater(R) real ball pitching machines. Product Features: 100% full grain leather cover Same size and weight of a regulation baseball for accurate game day simulation Heavy-duty Kevlar(R) seams for a realistic feel and extended ball life Cushioned Cork center, with wool windings Additional Details: Compatible with most Heater(R) real baseball pitching machines (not included) Should not be used with Lite-Ball(TM) machines Includes 12 balls (1 dozen) per purchase Recommended for ages 8+ 30-day manufacturer's money-back guarantee Manufacturer's warranty: 1 year Model: PMBL44 For additional information relating to the Manufacturer's Warranty, please contact 435-656-1756.