Hand strength is generated both in the forearm and the hand itself. Each finger is powered by a separate system in the forearm and power is transmitted to the fingers through the wrist. Gripmaster isolates and develops each section of the forearm while it stabilizes and strengthens the wrist. The GRIPMASTER is our signature model. It's ideal for any athlete wanting to develop hand strength. Available in four different color-coded models of graduated resistance, GRIPMASTER offers both men and women an opportunity to dramatically increase hand, wrist, and forearm strength.