Premium Material: The hand grip strengthener is made of high quality silicone, its sturdy design allows you to use it for a long time, elastic and strong, won't deform or tear, washable and durable. Ergonomic Design: The ergonomic design of the silicone finger exerciser is suitable for all ages and hand sizes, making it comfortable for you to perform hand exercises. Perfectly sized and portable, easily fits in your bag or pocket, you can exercise while driving, at the office, or anywhere. Rehabilitation Training Tool: This hand grip strengthener is perfect for rheumatoid arthritis, arthritis, tendonitis, carpal tunnel, tennis elbow, as well as recovering from a fractured or broken wrist, or any other activity that requires the use of gripping muscles. Enhance Grip Strength and Dexterity: Grip strength trainer build strength in fingers, palms, wrists and forearms, improves finger dexterity and performs a variety of activities including squeezing, pinching and stretching. The silicone finger exerciser also relieves hand pain and fatigue and improves blood circulation. 6 Resistance Levels: The hand grip strengthener provides you with 6 resistance levels including 6.6lbs, 8.8lbs, 11lbs, 30lbs, 40lbs and 50lbs, which can be applied to different stages of training, gradually improve your hand grip strength, perfect for beginners and advanced.