2024 New Ab Roller Wheel with Knee Mat &Timer, Automatic Rebound Abdominal Wheel Specification? Material: Alloy Steel+Plastic?+Rubber Color?Orange/Blue Function: works your muscles Weight: 3.5 Pounds/1600 grams Size: 40cm x 15cm x 17cm/15.74 x 5.9 x 6.69 inches Why choose us? 1.The surface of this ab roller wheel is natural rubber, which makes very little noice and will not disturb others. 2.The ab roller wheels are made of high-density rubber material to ensure it withstands even the most intense workout sessions, which will not damage the floor. 3.A strong core will help you perform a long list of daily movements with greater ease and a reduced risk of injury. It can support up to 800lbs. 4.It works your muscles and joints effectively and helps with overall body exercise and weight loss. Package included: 1 x Ab roller wheels 1x Timer 1x Mat About product installation: The product includes accessories such as elbow rest, roller and support rod. You need to assemble according to the instructions. The assembly is very simple and only takes 1 minute to complete. Frequently Asked Questions: 1. This product is not suitable for people under 8 years old 2. Don't know how to install? A: Please check the instruction manual and install it according to the steps 3. Can't rebound or move forward? A: You need to adjust the direction of your body so that the focus point and the roller are in a balanced state, maintain the strength of the body joints, and exert force in the forward direction to achieve the rebound effect 4. Packaging accessories are missing A: If you find that the packaging accessories are missing, please contact customer service for reissue or contact Amazon for return and replacement