Ibort Magnetic Health Hula Hoop BT-3013 Consists of 8 tubes,easy to combine,portable and convenient 40 magnetic massaging ball,effectively to burn calorie and lose weight EVA Silicone Foam,reduce the force of pressure to your waist,more comfortable and more effective 29 inches diameter,1.2 KG weight,good to workout. 7 tubes hoop also can exercise.