Technical Specifications: Material: Metal + Sponge Chassis diameter: 12.5CM / 5 " Adjustable height: 17-21CM / 6.4x8.3 " Width: 27CM / 10.6 " Color: Grey / Black Features and Benefits: 1.Using healthy natural materials, thick silicone suction cups, strong suction, safer and more stable 2. Multiple functions can help you roll up the abdomen, lift, kick, sit down, etc. 3. Add foam design, soft and comfortable 4. Ergonomic design, healthy and safe use 5. Easy to install and use Instructions: Keep the floor clean during use. Press the black foam with one hand and push the wrench down. Finally, make sure the connection is secure. Pull off the button to lift or press the foam bar. Package Contents: 1 x Abdominal Muscle Trainer Notice: 1. Please allow 1-3cm error due to manual measurement.Pls make sure you do not mind before you bid. 2. The color may have different as the difference display,pls understand.