CHAMPRO Weighted Training Baseballs provide a way for players to improve their in-game performance. Many players agree that weight variation training can increase their velocity when playing with a regulation game ball. Train with progressively heavier balls to work on building arm strength and throwing velocity. CHAMPRO's weighted training baseballs also have stripe patterns that allow pitchers to monitor the pitch rotation, helping them develop their skill set. These baseballs have raised seams and leather covers that are made to last. Select your choice of over and underloaded balls to create a weight variation set customized to your needs and goals. Available in weights from 3 to 12 ounces in retail packaging. Bulk packaging also available for 7, 9, 10, 11, and 12-ounce versions. WARNING: Weighted balls should not be hit with a bat or thrown to another player. They should only be thrown into screens or used for stretching exercises.