1.and The baseballs are molded with polyurethane plastic knobs, which ensures the of the player and increased durability over time. 2.Easy to track: With a bright green color, these baseballs are easy to track during training, making it convenient for players to improve their performance. 3. design: The lightweight design of these baseballs prevents possible damage when hitting or fielding exercises, allowing players to focus on their technique without distractions. 4.Pitching machine compatibilitySpecifically designed for use with pitching machines, these baseballs are perfect for perfecting handeye coordination. 5.Various sizes: Available in sizes 22.9 cm and 30.5 cm. These baseballs meet various difficulty levels and training needs. Choose the size that suits your practice requirements. 6.SpecificationsMaterial: PU; Color: Yellow; Size: 9 inches, 12 inches (optional); Diameter: 2 cm (2.8 inches), 9.7 cm (3.8 inches); Weight: 145 g (5.0 oz), 188 g (6.5 oz).