THREE REASONS WHY A DE JURE FITNESS GYM EXERCISE BALL WITH PUMP PERFORMS AT THE TOP OF ITS CLASS HEAVY DUTY ANTI-BURST RATING CAN MATCH ANY HEAVYWEIGHT: Anti-Burst Tested, Professional grade PVC material, extensive testing, and a unique anti-burst design provides for the highest quality exercise balls available on the market. THICK PVC CASING PROVIDES OPTIMUM PUNCTURE RESISTANCE: Packed with non-toxic PVC material. Our Exercise Ball is manufactured using gym quality standards, the exercise ball weight: 55cm-900g,65cm-1100g, 75cm-1300g, 85cm-1500g. NON-SLIP RIBBED BODY STAYS PUT WITH SKIN CONTACT: The PVC body has a matte surface with horizontal ribs contoured all around it -- making it easy to hold without slipping while tossing, bouncing or squeezing the ball even with profuse sweat. Sitting Exercise Ball Chair Practice perfect sitting by replacing your desk chair with an exercise ball. When you sit on top of an exercise ball, your body is constantly making small adjustments to remain balanced. In other words, you are working a large group of muscles doing so, thus gain strength in your core muscles. These core muscles connect your upper and lower body together. They also help support and protect your spine and back. Strengthening these set groups of muscles in turn will help improve your posture and reduce your risk of back injuries. Also especially for patients with lower back pain, using an exercise ball as a chair is proven to be beneficial. Save Time & Money A Live Infinitely Exercise Ball is one of the most beneficial pieces you can add to your workout collection. There are endless amounts of ways that you and your family can benefit from improved concentration for your kids to improved balance. You can start by simply replacing your desk chair with the ball to improve your posture while building your core. You can take that same ball and workout your chest, butt, abs and more without spending an extra time!