Protect and stabilize your CanDo exercise ball with these handy CanDo Ball Stabilizer Bases. They are constructed of latex-free materials and features a concave center to help keep the ball in place during exercise. These balance ball bases are specially designed to help prevent the inflatable ball from rolling away when in storage. They are ideal for individuals who are not yet prepared for the instability and movement of the therapy ball. These medium exercise ball bases are compatible with 65 cm - 75 cm balls.