Product Description Color: black Material: ABS+metal Package content: 1* gripper 1.BUILD STRENGTH AND DEXTERITY You can develop and maintain strength and dexterity in your fingers, hands and forearms. The ergonomic design and over molded finger pads and grip help make your conditioning workouts comfortable. 2.CUSTOMIZED TENSIONAllows you to adjust and customize the tension for each finger so you can strengthen individual fingers and prevent favoring certain fingers. 3.SIMULATED STRINGS By removing the reversible molded grip you can uncover a simulated string that helps develop and maintain finger calluses for string musicians. 4.ON-THE-GO CONDITIONING Whether you are warming up pre-show or conditioning when youre away from your instrument, the is the ultimate portable workout. At the office, at home or on the train, you can keep up your finger, hand and forearm strength and coordination. 5.Sleek, precise design The device is characterised by copper spring buttons with soft silicone padding for added comfort.