Engineered to develop the hitter's swing to produce consistent solid contact and backspin that results in line drives. Proper practice with the EquiTeee® will eliminate hitting problems caused by the uppercut swing. Made from solid rubber with specially engineered reinforcements to withstand the daily workouts of professional hitter. Adjusts from 22 to 37" height for effective use by professionals or T-Ball players. Designed by former professional baseball player Eric Rasmussen with the help of professional hitting instructors. EquiTeee® is used by many Major League hitters to improve and maintain their swing.