1. ABS plastic to prevent equipment aging, which is safe and durable 2.[Easy to use]360-degree shock-absorbing massage ring allows you to exercise comfortably and relieve the labor pain in the lower back that has been sitting for a long time. The smart hoop is easier to use and will never fall, even beginners can use it 3.[Detachable design tits all shapes body]Consisting of 24 or 12 detachable parts, detachable with a simple push of a button. You can adjust it according to your waistline. 4.[Quiet bearings]360-degree silent rollers can even and flexible rotate, making the smaller noise and smoother rotation