Developed with low-profile Kevlar seams, the Heater(R) Fireball Leather Baseball is strategically designed to work in tandem with all Heater(R) pitching machines to deliver greater accuracy and durability. These full-grain leather balls also match the weight and size of regulation baseballs, providing consistent as you put in the work during sessions at the cage. Premium Training Ball: Full-grain leather cover provides an official, game-like feel that maintains solid durability Matches the same size and weight as regulation baseballs Low-profile seams are strategically designed to perform better when using with Heater(R) pitching machines Kevlar integration throughout the seams reinforce overall durability for longer lasting performance Additional Details: Comes with 12 individual Fireball Leather Baseballs Manufacturer's warranty: 1 year (parts and labor)