Ideal for playtime, gymnastics, therapy and isolating upper and lower body muscle groups while strengthening core muscles. Improves flexibility, strength, balance and coordination. Made from the highest quality Italian resin materials. One piece, heavy duty roto-molded balls with raised ribs for better handling. Supports over 500 lbs. Latex free. Very high quality exercise balls come with an unconditional 5 year guarantee. Please choose size.