Make sure this fitsby entering your model number. ANTI-BURST TECHNOLOGY. Built with professional quality 4mm thick PVC material, this air-filled half balance ball can work under the maximum pressure of 664 lbs. What's more, with the help of added barrier film and lightweight anti-burst porous structure, the balance trainer will not burst but only deflate slowly while punctured. The anti-burst technology definitely makes your workouts safer and worry-free. SAFE & ANTI-SLIP DESIGN. Our half balance ball is made with slip resistant and non-toxic material that allows you to safely exercise with it. Inspired by the cloud shape, the upgraded cloud textured surface not only adds beauty to the balance ball, but also allows for a stronger grip, to avoid injuries and accidents to the maximum extend. It comes with a foot pump so that you can adjust the inflated level as what you want easily.