Step up your game with the Mark 1™ Official League Flat Seam Baseballs. These baseballs are perfect for both team practices and league play, offering the high-quality performance you'd expect from an official league ball. The synthetic leather cover gives a traditional feel, while the resilient cork center ensures they hold up to even the most powerful hits. Each ball is official size and weight, ensuring your training is as close to game conditions as possible. Plus, your purchase is protected by a 1-year warranty.