Specification: Features: 1. Ergonomically designed according to the shape of human foot. Improve circulation and reduce fatigue. 2. The disc will massage and stimulate meridian points on the bottom of the feet and help promote good health. 3. With non-slide pads on the bottom, our product can increase the friction between itself and the ground while reducing the noises making by contact. 4. This small piece of equipment makes it easy to stretch and get waist exercising wherever you are. At work, at home or anywhere. 5. Quality ABS materials made, which is durable and sturdy. Precision ball-bearing ride for smooth motion. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material: ABS, magnets Size: As the picture shown Color/Style: As the picture shown Weight: 539g Package List: 1 x Twisting Waist Disc