Knockerball™ is a single-chamber, inflatable sphere with inner handles and adjustable shoulder straps. They range from 1.2 to 1.5 meters, and the size / fit is predicated by your height. Knockerballs™ can be used in a solo setting to perfect your rolls, flips, and wheels. “KnockerBallers,” or avid players of the sport, describe the sensation as almost gravity-defying. Just imagine the sensation and mobility that a Knockerball™ allows you to experience… without putting any stress on the body!