Widening Four Wheel Large Panel Elbow Support: ab roller wheel 4 wheel stable design, elbow support area of 100%, micro rebound design, larger and more uniform force contact surface, effectively avoiding rollover. The 300mm wheelbase is more stable. The product adopts a durable structure made of high hardness ABS, PP, TPR and PA materials, ensuring the durability and high quality of the product. Foldable Dual Grip: The ab roller grip is comfortable, and this unisex abdominal roller is designed to be versatile for easy storage, making it an ideal addition to any home gym or fitness plan. It is easy to use and effective, suitable for beginners to use, and can effectively exercise the entire upper body.