1. Quiet, smooth rolling abdominal exercise equipment with no wobble on all floor types. The large, sturdy PVC ab roller wheels support heavier body weights. 2. Everything your core needs for an abs workout. Sculpt a flat stomach and six pack abs. You ll feel the burn as you build muscle and burn fat. 3. Strengthen the elasticity and apply within 300 kg of weight. Yoga fitness aids are used. 4. Supporting the use of the belly wheel, the small ring is placed on the handle of the belly wheel, and the big ring is placed on the foot. 5. Resistance bands make this the most complete ab wheel trainer to strengthen 5 body parts: abdominals, shoulders, arms, and upper / lower back. Specifications: Color: gray + black Material: latex tube + thick webbing Size(approx.): total length 95cm/37.40"", elastic part 50cm/19.69"". Can stretch 2-3 times, the strength is about 18-20 pounds