... quality Material: Steel,EVA/PVC,Foam,ABS Accessories: IB,CD,timer,ball,pump,rope Total Core abs eliminates this first jerking motion and ... then guides you through a smooth, full range motionThe Total Core abs starts with a jerking motion, which causes stain on ... you are comfortably seated and properly supported. The secret behind Total Core is the unique, progressive resistance system that ‘pushes’ ...