Type : Single-Wheeled Function : Waist & Abdomen Exercise Application : Breaststroke Abdomen Trainer Type of sports : Strength Training Advantage : No Noise Abdominal Wheel Application : Abdominal exercises Durable material and lightweight portable to carry. Has dual wheels for stability and non-slip handles for comfort. Designed to work and build the abdominal muscles. Idea for burning excess calories. Specifications: Material: stainless steel, rubber, PVC Item type: wheel rolle Size: 11.7"*6.24"(L*D) Package List: 1 * Abdominal Roller Notes: 1. Due to the difference between different monitors, the pictures may not reflect the actual color of the item. 2. Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement. 3. Please leaving a message before you give the bad feedback, if the products have some problems. Thanks for your understandings.