The Weplay Forever Up-Down Playset is designed for use with both hands. Simply grip the sides and practice turning it inward and outward repeatedly. Once you are familiar with its operation, place the ball of choice on the track. The object of the exercise is to control the ball without dropping it. This activity is suitable for everyone. It enhances one's reflexes and concentration as well as improves hand-eye coordination and hand muscle control. The balls are made of two different materials to provide different speeds and challenge levels.