Improved Design, Easy To Adjust, Meet Your Multiple Workout Needs: The grip reinforcement adopts a knob to adjust the strength, which makes the adjustment quiet, convenient and smoother.  Aluminum handle, steel spring, make the handle more strong and durable, not easy to break: The handle (10cm long) is made of aluminum, which is not easy to rust. The steel spring makes the clamp more firm and durable. The diamond design of the handle ensures that it will not slip and hurt your hand. What's more, the non-slip NBR gloves make your training more comfortable. Easy To Carry, Easy To Use, Will Be Your Good Hand Training Helper: The wrist muscle is easy to use, convenient to carry (200 g). It's perfect for the musician, guitarist, athlete, golfer, rock climber, tennis player and office worker. is a good choice for training your fingers, wrist, arm flexibility and muscle strength. Suitable For Improving Hand Strength And Hand Injury Recovery: Whether you are an athlete or a fitness enthusiast, who has strict grip requirements, the forearm muscle trainer will be your right choice. If your hand is suffering from muscle fatigue or joint pain, the hand muscler can effectively help you relieve hand muscle fatigue and repair hand injuries.