Gametime Tee Stackers Hitting Trainer This is an exciting new training tool for baseball and softball players. The Tee Stackers unique design allows you to stack two or three balls on the tee at one time by placing a Tee Stacker betwe - Baseball Hitting Aids Stack two or three balls on the tee at one time by placing a Tee Stacker between each ball. If you swing cleanly on plane through the top ball, the Stacker slides off and the next ball is ready to hit. If you swing off plane by topping the ball, casting, uppercutting, etc, the Stacker is disturbed and the remaining balls will fall. Using Tee Stackers gives you instant feedback on every swing. Tee Stacker drills improve focus and makes hitting from a tee more challenging for all ages and skill levels. Use different sizes and colors of balls while changing hitting planes on each swing. Can be used with a single or double tee. The Tee Stacker 2-Pack includes two Tee Stackers, two attachment cords with locks, and a mesh carrying bag. Directions and basic drills are included in the package.