Feature: 1. AUTOMATIC REBOUND: Abdominal roller wheel features automatic rebound technology and a built in braking system for smoother, more efficient steel spring rebounding. The smart chip includes an intelligent timer and dual low noise operation. 2. ERGONOMIC DESIGN: Ergonomic handle design to activate arm and core muscles, and the handle can be detached for easy storage and transportation. The ultra wide roller wheel maximizes abdominal exercise effectiveness. 3. STABILITY AND SAFETY: The extra wide wheel surface ensures stability during training for left, right, and middle abdominal muscles, as well as targeted training of oblique muscles. 4. ABDOMINAL EXERCISE: Abdominal roller wheel kit helps both men and women burn belly fat and build abdominal faster, making you stronger and more confident. 5. CORE STRENGTH TRAINING TOOL: Abdominal roller wheel is a potent core strengthening exercise tool that, when used correctly, can help strengthen abdominal and core muscles. Specification: Item Type: Abdominal Wheel Material: PP, metal Battery: 1 x 1.5V 140mAh LR44 button cell (built in). Package List: 1 x Abdominal Wheel2 x Handle1 x Mat1 x Instruction Manual