MATERIAL - Made of durable and environmentally friendly aluminum and steel alloys, the hand trainer offers strength levels from 50 to 200 lbs. It is strong enough to withstand more pressure and weight. In addition, the trainer has great flexibility and does not slip. EXIT STRESS - Ergonomic and easy to use. Soothe and reduce your stress levels by stretching for as long as possible. Focus on building up the tension in your muscles until they are tired. And then you feel the relief when you let go. STRENGTH GROWTH - As a grip enhancer, you can train your strength and muscles well. It is very helpful to strengthen the muscles in your arm, wrist and forearm. Ideal for conditioning the extensor muscles of the hands, preventing hand fatigue, arthritis, overwork and the first signs of carpal tunnel. WIDE USE - Perfect for pianists and guitarists, golfers and climbing enthusiasts, or for anyone who needs stress reduction, rehabilitation, stroke recovery, muscle memory, muscle strength. fingers and grip PORTABLE - The hand muscle trainer is easy to take with you for everyday use. Suitable for intermediate exercises in the office. Anyone who still works on a PC should have this trainer to strengthen their joints and tendons and to train their hands and fingers. Specifications: 200LB