Knockerball is a single chamber inflatable sphere with inner handles and adjustable shoulder straps. Knockerballs range from 1.2 Meters to 1.5 Meters and the size or fit is predicated on your height. Knockerballs can be used singularly to perfect your rolls, flips, and wheels. "KnockerBallers" describe the sensation as almost defying gravity, just imagine the sensation and mobility that a Knockerball allows you to experience without putting any stress on the body. With two or more Knockerballs the experience is catapulted into rip roaring laughter, exhilarating knocks and rolls that will keep you coming back for more.