The VersaBall Pro Stability Ball can withstand more weight than the VersaBall. It is constructed of high-quality, professional-grade materials and won’t pop if punctured. Instead, it will deflate slowly if a puncture occurs while in use, significantly reducing the risk of injury. Easy to inflate; includes a tape measure to make it easy to tell when you’ve added the right amount of air. Sold individually. Storage options and pumps available (sold separately). 55 centimeters: 61-67 inch user. Since 1986, Power Systems passion for fitness has been fueled by Power Systems’ customers. Power Systems is committed to ensuring people have the tools to lead active lives with professional-grade products, cutting-edge educational materials, and elite customer service. Power Your Potential is the philosophy that guides everything Power Systems stands for.