The most versatile of all Roll Model® Therapy Balls, the Coregeous® Ball provide a gentle approach to the deepest of massages. With a unique grippy “skin”, this air-filled self-massage ball safely reaches your innermost abdominals and Vagus Nerve, activates your core and psoas, or can be used in place of a solid Therapy Ball for decreased palm pressure. *This product includes 1 Coregeous Ball and inflation straw.