Diameter： 36 cm
1.Perfectly support 360 degree rotation, let your whole body move because of it!
2.Unique ball point designed for fitness, yoga, or re-healthy training.
3.10-20 degree tilt in which to find the balance and exercise your flexibility.
3.For home fitness and office use, give foot a loose in spare time.
4.The high-strength design at the bottom is capable of bearing 150 kg.