Information about this product With Gravity Ball: The hula hoop has a soft gravity ball. Simply rotate the smart hula hoop to simply rotate the hula hoop according to the inertial path. 360 Surrounding Massage: Wave-shaped massage contacts rhythmically surround the waist and abdomen, greatly enhancing the fat-burning effect. Silent bearing: 360-degree silent roller, smooth and flexible rotation, low noise, and stable rotation. The smooth bearing has 28 built-in balls, the speed is smoother, and the rotation is easy without jamming. Removable: The hula hoop is detachable, you can take it off by pressing the button. You can choose a hula hoop that suits you according to your waistline. The parts are easy to remove and store. Applicable people: You can now achieve your daily hula hoop goal without spending a lot of energy and time. Suitable for people who need to lose weight/postpartum mothers, office workers/students.