The Ultra Instructo-Swing batting tee helps hitters practice swinging a bat the correct way. A hitter will start to develop the type of swings that produce line drives, hard ground balls and fly balls that carry. The Instructo-Swing allows you to consistently practice proper hitting mechanics and produces immediate feedback for an improper swing. Be a better switch hitter by using it to develop and maintain the proper swing mechanics from both sides of the plate. The included Retract-a-Ball devices enables players to get more reps without having to continuously chase balls.