Product Information:Material: Aluminum AlloyResistance: 100LB≈45KGFunction:Comfortable sponge covering providing extra grip and hand protection.Strength and flexibility training for forearms wrists fingers.Whether you are a musician athlete or ordinary person you can use this hand trainer to improve finger strength and flexibility.Product List:1 pieceNote:Due to the difference between different monitors the picture may not reflect the actual color of the product. We guarantee that the style is as shown.Due to different measurement methods there may be an error of 1-3mm.Training should start with low resistance and gradually increase to higher resistance to avoid muscle strain caused by overtraining.Perform appropriate warm-up activities before training to promote blood circulation and reduce the risk of injury.