Strengthen and tone your abs, shoulders, arms, and back with this wheel. The unit teams up a pair of nonskid wheels and two easy-grip handles. To use, simply get on all fours, grab hold of the handles, and glide the wheels back and forth across the floor. At various points during the exercise, you work for every major upper body muscle group. 2 anti-slip wheels the polyurethane outer ring muted comes molded comfortable grips with a thick foam handle anti-skidding, absorbs sweat and made of new PVC, Brightness of color, healthy environment strong of bearing capacity, with thick of steel, the diameter is 1.2mm max loading is 200KGs