... 1.2~1.5mm steel 2. High quality foam 3. PVC wheel Hottest and high quality total core Functions of total core ... contains: Total Core, manual 4) LCD showed counter, time, step/min, cal(if need, pls tell me) ... back of your core, all at the same time with the Total Core Exerciser. Total Core does ... behind the Total Core is the unique, progressive resistance system that "pushes" you upward with more of a " ...