Isokinetics Inc. brand Exercise Balls are quality products we bring to you direct from the manufacturer. No middleman means you save! And, we provide all of our balls with a 1 year guarantee, administered directly by our friendly staff based on Arkansas, USA. Our Anti-Burst Ball is made of special durable PVC material (latex free) that prevents bursting even when the ball is punctured by a sharp object. Tested to support up to 500 lbs of static weight. PUMP NOT INCLUDED.