This product is a total hand strengthening workout equipment for all fitness levels, from beginner to advanced, home and gym. Features: Helps to improves strength, power, and speed in fingers, wrists, and forearms. Can relieve anxiety while increasing bl-ood flow to your hand, finger, and arm. Nice hand strength exercise for those who have Arthritis, Tendonitis, Carpal Tunnel, and those who are recovering from tendon surgery. Intelligent counting display, the quantity you have done would be shown on display. Adjustable resistance, you can adjust it according to your need. Ergonomic design fits all hand sizes, for men and women. Portable and lightweight, convenient for you to carry. Can be done at home or in office with just 5 minutes per day. Suitable for athletes, musicians, rock climbers, tennis players, ect. Specifications: Material: PP plastics + spring steel Color: black Resistance range: 5~60kg /11.02~132.28lb Item size: 160 * 110 * 22mm / 6.3 * 4.33 * 0.87in Package size: 160 * 110 * 27mm / 6.3 * 4.33 * 1.07in Package weight: 170g / 6ounces Note: 1.Due to the different display screen and light effect, the actual color of the item might be slightly different from the color showed on the pictures. 2.Please allow a little measuring deviation due to manual measurement. includes: