Our most durable stability ball! Made of heavier, thicker-gauged PVC material with an updated, dimpled surface - this ball is more resistant to puncture, deformity, or losing shape. Ideal for heavy traffic and commercial use facilities. The smooth, slightly dimpled surface offers a full 360-degree range of use, no raised surfaces to impede comfort when rolling your body on it. Easy to inflate, and includes a tape measure make it easy to tell when you've added the right amount of air. Black. Two sizes available, diameter clearly marked. Sold individually. Storage options and pumps available. Features: Black. 2 diameters available - 55 cm. and 65 cm. Smooth dimpled surface. Heavy-duty materia; Burst resistant up to 1130 lbs; Slow deflate; User's Height Listing: 55 cm: 5'1" to 5'7". 65 cm: 5'8" to 6'1".