High quality balance disc constructed completely of nontoxic materials. PVC, Phthalate, Latex and Chloride Free! A very versatile "eco-friendly" piece of equipment that looks great. Heavy duty feel with circular ribbing on one side and pimple grip on the other for extra grip. Inflation can be adjusted to suit individual needs. The larger diameter and height allows for a huge variety of exercises as both hands or feet can be comfortably placed on the cushion.