Adjustable resistance - With a rotating knob in front of the grip reinforcement, you can adjust the resistance within a range of 10-50 kg. The resistance is changed by turning the knob clockwise for a higher resistance level. Multifunctional hand exerciser - Hand exerciser finger trainer set helps train your finger flexibility, strengthen the strength of your hand, wrist, and forearm, and can also relieve hand fatigue and stress. Suitable for primary strengthening, muscle training, and improving grip strength, as well as rehabilitation training. Non-slip handles - Covered with environmentally friendly TPE materials, it is soft and prevents it from accidentally slipping from your hand when it gets sweaty. The ergonomic design fits comfortably in your hand and is suitable for all hand sizes. Perfect for men and women, seniors and teenagers. Lightweight and portable - The handle weighs 150 g, is 15 cm long, and is easy to clean and store. The lightweight design of the handle makes it ideal for carrying in your bag. You can exercise anytime, anywhere.