CanDo Inflatable Balls are used to improve balance, coordination, flexibility, strength and even just for fun. These balls are used as aids for vestibular movement, equilibrium therapy, as seats, and even by pregnant women in birthing classes. Fitness professionals can use CanDo Inflatable Balls as an aid for stretching and strength programs. The balls feature a non-slip PVC vinyl surface that is ribbed for extra security. The balls may be "under" inflated to give a soft, mushy feel or fully inflated for a firm, bouncy feel. 300 pounds weight capacity.