Gymnic FitBall The Gymnic FitBall is the only burst-resistant ball with dynamic elasticity. These flexible balls are a powerful head-to-toe workout tool for every fitness and ability level. Like all therapy balls, these balls are great for balance, posture, trunk control, visual tracking, and more. The FitBall, however, is made of a special material that resists bursting by stopping the cut from expanding. If punctured this ball will slowly deflate giving the therapist time to safely remove the child from the ball. FitBalls are perfectly round, roto-molded, weight tested to over 600 lbs., and manufactured with Gymnic® Plus material. Boxed with poster. We have this item at the office.