The Bender Ball allows you to work your core in ways you cant do with standard crunches or large exercise balls. This unique workout incorporates Leslee Benders Selective Stabilistaion method to bring you the best possible results. So you can sculpt abs fast. The Bender Ball Complete Kit includes - a Bender Ball, Combo DVD: The Bender Method of Core Training and Buns and Thighs, with an instruction manual. 200mm (8) diamter Bender Ball can be inflated/deflated to suit. Latex free. General information: Size H6.5, W14, D25cm.