Develops and maintains the strength and dexterity of your fingers, hands and forearms. Features: Soft button cap makes it comfortable to press. Provides a complete strength training solution for fingers, hands, wrists, and forearms. Promotes finger strength, flexibility, coordination and speed. Improve the ability of beginners to fingertips, including the flexibility of the fingers, according to the strength of the string, to reduce errors, according to string sound more accurate. This is like practicing dumbbells, adhere to the daily training, finger strength slowly to improve, for the instrument playing the skills needed, will naturally be able to control. Specifications: Color: white, black, yellow, pink, blue (optional) Strength adjustment range: 2.5 lbs to 6 lbs Item size: 80 * 72mm / 3.1 * 3.0in Item weight: 60g / 2.1ounce Package size: 200 * 135 * 30mm /7.9 * 5.3 * 1.2in Package weight: 100g / 3.5ounce Packing List: 1 * Finger Trainer