Item Type: Double Round Abdominal Wheels Roller Product Material ABS, Metal Weight: Approx. 1410g / 3.1lb Product Size: Wheelbase: Approx. 140mm / 5.5in Wheel Diameter: Approx. 110mm / 4.3in Purpose: Fitness, Abdominal Fitness, Chest Expansion Package List 1 x Sports Wheel 1 x Support Rod 2 x Handle 1 x Protective Pad 1Exercise Muscle Groups: Abdominal wheels roller can exercise more muscle groups in the whole body, such as arm muscle group, chest muscle group, abdominal muscle group, back muscle group and lower limb muscle group. 2Designed with Mobile Phone Shelf: You can follow the teaching video for reference while exercising, or follow the drama, listen to music, and relax by video call. 3Reasonable Design: Silencing silo design, built in strong spring, automatic springback, comfortable and safe movement. Arc top design, multilayer materials, thickened load bearing structure. 4Multi Layer Material Mute Noise Reduction: Anti skid layer, reinforcement layer, damping layer, noise reduction layer, support layer. 5Anti Skid Tire Texture: 105mm widened and flat wheel hub is stable and safe, providing you great using experience.