Constructed of high-quality, professional-grade materials and will not pop if punctured. Instead, they deflate slowly, significantly reducing the risk of injuries if a puncture occurs while in use. Easy to inflate and includes a tape measure that makes it easy to tell when you have added the right amount of air. Sold individually. Storage options and pumps available. 65 cm ball is designed for user height of: 5 feet 8 inches to 6 feet 1 inch. Since 1986, Power Systems' passion for fitness has been fueled by our 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.