Feature: 1. Built-in strong spring design, greater resistance can prevent the rollers in the movement of slipping, to achieve better training results, to avoid overtraining and injuries and other problems. 2. The ab roller uses silent automatic rebound technology, which can protect you from injury during exercise. 3. Uses a larger and wider double-wheel design, reducing the swing of the abdominal roller, making the abdominal movement more stable and controllable. 4. The removable handle wrapped up with thick foam, comfortable grip, sweat absorption, easy to remove or install. 5. With cell phone holder function, convenient for you to watch instructional videos while exercising, or enjoy watching TV, listening to music or browsing cell phones while exercising. Specification: The elbow support rebound abdominal wheel will be the abdominal muscle exercise machine and flat support machine in one, combining two types of exercise in one, allowing you to effectively train the abs and other core muscles, easy to use, making exercise more scientific. Features: Built-in strong spring design, greater resistance can prevent the rollers in the movement of slipping, to achieve better training results, to avoid overtraining and injuries and other problems The ab roller uses silent automatic rebound technology, which can protect you from injury during exercise. Uses a larger and wider double-wheel design, reducing the swing of the abdominal roller, making the abdominal movement more stable and controllable. The removable handle wrapped up with thick foam, comfortable grip, sweat absorption, easy to remove or install With cell phone holder function, convenient for you to watch instructional videos while exercising, or enjoy watching TV, listening to music or browsing cell phones while exercising. Specifications: Material: Plastic Wheel width: 10cm/ 3.9in Weight: 2kg/ 4.4lbs Package List: 1 * abdominal wheel Package List: 1 * abdominal wheel