CHOICE OF 3 SIZESChoose from 55, 65, or 75cm size to suit your height and purpose. Wide range of sizes helps you find the ideal ball for yoga, ab work, Pilates , core training, pregnancy exercise, or office chair. Secure Grip and SafetyBurst-proof construction ensures air will escape slowly. European toy safety standard tested and made from high-stretch material. Strength core and flexibility Balance balls are perfect for all types of training at the gym or in your home. You can comfortably work almost every major muscle group. Stability work is great for your core and can also help improve overall flexibility, balance, and coordination. It even does your posture a solid. AccessoriesInflator, cap, cap opener. High gripnon-slip surface for safe use when performing weighted exercises.