Because of its innovative peanut shape, this yellow exercise ball is easier to control and only rotates forward and backward. The middle offers extra support to patients and laboring mothers. Also adds to any fitness program by aiding the development of muscles, coordination, and balance. Can support up to 300 lb. The sturdy ball is not made with natural rubber latex and is phthalate-free. Ball measures 40-cm (16") diameter; 35" long.