[hand trainer] - Improve the strength of your hands, fingers, wrists and forearms, improve the grip strength of your hands and fingers, endurance, mobility, muscle tone and fine and gross motor skills . Perfect for athletes and people with arthritis, tendonitis and carpal tunnel. [Adjustable resistance] - With a rotary knob in front of the handle brace which allows you to adjust the resistance in the range of 10 to 50 kg (22 to 110 lbs). The resistance is changed by turning the knob clockwise for a higher resistance level. [Non-slip grips] - Covered with environmentally friendly TPE material, soft and prevent it from accidentally slipping out of your hand when it sweats. The ergonomic design makes it easy to hold and is suitable for all hand sizes. Perfect for men and women, seniors and teens. [Lightweight and portable] - The handle weighs 150g, is 15cm long, and is easy to clean and store. Thanks to the lightweight handle design, it can be stowed away in the bag, ideal for traveling. You can train anytime, anywhere. [Excellent material] - Made from all metal rings and strong stainless steel spring, wear and rust resistant, no deformation, which guarantees lifetime use. Fixed firmly and securely to the handle, it never breaks. Product information Size: 10 x 16 x 2 cm Feather diameter: 1.8 cm Resistance range: 10-50 kg Material: stainless steel and polypropylene Hand grippers effectively train fingers, grip, and forearm.Durable Tool: Made from high quality stainless steel tension spring. Resistance from 10 to 50 kg, suitable for beginners and advanced users.Ergonomic design, perfect for men and women, seniors and young people. Portable: Small and light, you can use it whenever and wherever you want. Quickly increase wrist and finger forearm strength with the best hand device. A great choice for people of all ages Reinforced stainless steel spring Ergonomic and non-slip handle Resistance adjustable from 10 to 50 kg Rehabilitates the forearm, wrist, hand and fingers Stress Relief and Therapy Tool Ideal training device for everyday use