This is a balance disk recommended for core training. It comes with an air pump, and you can adjust the air volume to achieve your preferred firmness. Suitable for a wide range of users, from beginners to advanced. It can be used for various purposes, such as rehabilitation, dieting, and postpartum body shaping. In addition to training, it can also be used on a chair to support posture and improve concentration. It's an easy-to-incorporate item for daily life and can be used continuously without strain. 【Product Description】 Color: Purple Size: Diameter approx. 34cm / Thickness approx. 4.5cm Weight Capacity: Approx. 100kg Material: PVC ※Includes air pump (color cannot be selected) 1025-1199-1499