Backspin Batting Tee- Baseball/Softball, Pro/Standard Amazon's only official distributor the edison award winning - backspin tee. Only batting tee in the world that features an inverted tee to train the eyes to focus on the most important part of the baseball: the bottom-middle half. Double wrapped flexible cones heavy base cone added for extra weight. Industrial strength clamping mechanism that dampens vibrations when hit, height adjustability from 18 to 48. Angle chart graphic on base plate that shows proper launch angles for line drives.