Designed by former Major League player and coach Eric Rasmussen with the help of professional hitting instructors, the CHAMPRO EquiTeee® Batting Tee is designed to develop a quick and direct swing that produces consistent hard contact and backspin and results in line drives. The EquiTeee® eliminates habits that cause an uppercut swing by providing instant feedback. The hooked end blocks swings that result in pop-flys, encouraging players to aim downward and deliver line drives instead. It's made from solid rubber with special reinforcements and designed to withstand the daily workouts of a professional hitter, as many Major League hitters use it to improve and maintain their swing. The EquiTeee adjusts from 22 to 37 inches for practice hitting pitches high and low and making it easy to use for players of all ages and skill levels, from T-ball to Major Leaguers.