Features: 1. Using healthy natural materials, thick silicone suction cup, strong suction, safer and more stable 2. More than one function to help you roll your belly, lift, kick, sit, etc. 3. Add foam design, soft and comfortable 4. Ergonomic design, healthy and safe to use 5. Convenient to install and easy to use Tips: 1. Keep the floor clean when using. 2. Press the black foam with one hand and push the wrench down. Finally, make sure the connection is secure. 3. Pull out the back button and the foam strip can be raised or pressed down.