Features: 1Exercise shoulder, arm and back muscles to make the body healthy and strong. 2The arm power exerciser has a strong rebound, help you build the perfect body figure. 3Build up your forearm strength and wrist strength, if insist to use, the effect of bodybuilding is remarkable. 4Non-slip rubber handle, conform to ergonomic designs, easy to grip and use. 5Made of carbon steel spring material, safe and eco-friendly, stable and durable. Condition: 100% New Item Type: Material: Spring Steel Color: Black Optional Strength Grade: 20KG (suitable for people who just started exercising), 30KG (suitable for teenagers / lady), 40KG (suitable for fitness professionals), 50KG (suitable for strong men), 60KG (suitable for Hercules) Function: Exercise shoulder, arm and back muscles to make the body healthy and strong. Usage: 1. Stand with your legs apart, bend your right elbow, bend the spring with your left hand, then bend your left elbow and bend the spring with your right hand. 2. Straighten the arms upwards, bend the spring, and then gradually relax, repeating several times. 3. Bend the spring forward with both arms, then gradually relax. 4. The body bends downward, and the arms bend the spring. 5. Stretch your arms backwards, hold the spring tightly and straighten it downward, gradually bending the spring. 6. Keep exercising, and the effect of bodybuilding is remarkable. Package Included: 1 x (60KG Grade)