There are 3 types of hand extension exerciser, 20 lb, 40 lb, 60 lb, which can be combined into different resistance; With the help of the hand extension exerciser, you can not only enhance the strength of the fingers, forearms, and wrists, but also isolate and train the flexibility of each finger separately, convenient and practical; Please choose the right before buying. the guitar finger stretcher is mainly made of quality silicone material, with a nice elasticity, stable and reliable to use, hard to tear, break or deform, easy to clean, can be kept and applied for a long time. the guitar finger trainer is suitable for office workers, students, teachers and other people who are prone to hand fatigue, helping them reduce the hand stiffness, and improve finger function and movement.