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This hand expander is perfect for warming up the wrist joints and working out the muscles throughout the arm. This is useful for those people who want to keep fit even while working. After all, you can easily sit and write or type something on a computer, and squeeze the expander with your other hand. The hand expander improves sensory sensitivity and motor functions of the hands. It also brings relaxation and an anti-stress effect. By training your hand with such a simulator, you will definitely get a strong handshake! The exercise machine is made in the shape of a ring from high-quality rubber.