A Knockerball is a single chamber inflatable sphere with inner handles and adjustable shoulder straps. Knockerball is for much more than a classic game of KB Knocker Soccer ("Bubble Soccer") or to be used for perfecting incredible stunts - your rolls, flips, wheels, knocks, bounces, and bumps! We have multiple game modes that our Event Coordinators will facilitate to ensure the smiles never fade! Knockerballs range in size, and your height determines the proper size – we have medium, large, and extra-large.