The Muhl Sports Advanced Skills Batting Tee is designed to help experienced players perfect their bat skills and beginning players learn proper mechanics. This innovative swing trainer features a forward arm and outside swing barrier for a realistic experience and instant feedback. An improper swing results in the bat slapping the flexible polyurethane post or arm. The replaceable cup brush accommodates softballs, baseballs, or poly-balls, and delivers a clean "swish" through the ball without transferring any shock to the bat or hands. Batting practice will be safer, easier, and more effective with this premium tee.