More control over the path of the ball! With the PRO Turntable, passing balls cause a mechanical turntable to rotate. As a ball rolls down through the stone, it changes its direction and at the same time turns the turntable. This allows for more variations of the track and control over the ball's path. Combined with any GraviTrax starter set, the GraviTrax PRO Element Turntable brings even more variety and ball fun to the GraviTrax universe.