Striker II Hitting Trainer by Schutt®. Because it allows any player to complete thousands of repetitions and fine-tune their swinging skills, the Schutt Striker II Hitting Trainer acts as the perfect warming up device for baseball or softball. Comes complete with a 9" safety (rubber) baseball that won't harm thin-wall aluminum bats. Quickly attaches to any chain link fence, and it also fits easily into a player's bag. This is a self-service type trainer ball players like because they can practice on their own. Coaches like the Schutt Striker II Hitting Trainer because it frees them up to attend to other training needs.