These Popper Balls are designed to be used with the Bandit Sports Tee Popper, a baseball training aid that allows for solo batting practice and hand eye coordination improvement.These baseball training balls are the perfect tool to use for your batting practice needs when there ...These Popper Balls are designed to be used with the Bandit Sports Tee Popper, a baseball training aid that allows for solo batting practice and hand eye coordination improvement.These baseball training balls are the perfect tool to use for your batting practice needs when there are no teammates around. Made of durable rubber, these balls are designed to withstand the rigors of your baseball training sessions.The size and weight of these balls are great for hitting drills, to simulate baseball gameplay and to help improve your hitting and hand eye coordination.