The Firstaid4sport Light weight strong wobble board is ideal to train your way back to full fitness and to integrate balance into every aspect of sports performance and rehabilitation. This Balance Board is perfect for strengthening weak ankles and your core muscles. Made from strong plastic. Simply stand on the Wobble board and use muscles to balance on the board. The diametre of the surface is 40cm, and the rounded base to balance on has a rough diameter of 10cm. The board tilts to a maximum of 20degrees.