K-fashion &reg; Body Massager Fitness Vibration Machine Massage Round Waist Twister Disc The bodytwister holder is made of high quality ABS material, reliable and durable The surface with many bulging design is helpful to massage your feet It is a favorable bodytwister to help you get rid of toxin and improve blood circulation It would make a great contribution to your slender waist It can help improve the wry of your hip bone, adjust the balance of muscles around the waist, then compacts muscles in your waist and hip