Product Description: Style: Adult, Color: Black, Material: ABS + Metal, Package Included: 1 * Grip, Description: Multi-purpose: This 4-button finger training device is developed for a variety of instruments such as guitar and trumpet. It also helps with finger strength training. Adjustable Tension: The tension of each finger can be adjusted between 3 pounds and 8.5 pounds. You can lock 2 buttons at the same time, so that you can choose different tensions for each finger and choose the finger to exercise as needed. Unique and High Performance: Environmentally friendly silicone provides a good grip during training, and the copper core spring provides good resistance for strength training. Comfortable Grip: The non-slip particles on the surface of the silicone are not easy to slip from the palm. The groove design at the bottom makes pressing more comfortable. Very Portable: Portable size, you can put it in your suitcase, bag, purse, wallet, etc. It is convenient for you to strengthen your finger strength at any time.