Product Description Material: Plastic + Metal Size: adjustable strength Colour: Black Quantity: 2 pieces Package content: 2 pieces * gripper 1. [Ergonomic handle] -The ergonomic shape of the handle is particularly comfortable and firm. Thanks to the special surface structure, our muscle hand trainer can ensure ideal running without slipping 2. [Special counting function] -Using this function, you can record the number of continuous printing process every time you use it between 0 and 99. Our unique manual trainer can be continuously adjusted between 5 and 60 kg, so it is perfect for beginners and experienced 3. [Absolute Quality, Highest Quality] - The use of special high quality materials and super strong steel springs make our exercisers unique and durable Whether at home, traveling or in the office: our finger trainers are ideal companions. 4. [Rehabilitation Equipment] -As a rehabilitation equipment, the hand trainer finger training kit is suitable for treating patients with hand injuries, tendonitis, arthritis, carpal tunnel and tennis elbow. Quickly strengthen target muscles without damage. 5. [Wide range of use] - Temporarily relieve stress to increase forearm strength and hand strength. is a forearm training equipment used for fitness, exercise, rock climbing, bouldering, tennis, boxing, rehabilitation, guitar, etc. Your intake will no longer interfere with your progress in the gym.