Isokinetics Inc. PT (Physical Therapist) Exercise Balls are professional grade physical therapy and exercise products we bring direct to you. No middleman means a fair price for the quality. 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 latex free material that prevents bursting even when the ball is punctured by a sharp object. Tested to support up to 500 lbs of static weight. Clinic packaging. PUMP NOT INCLUDED.