GHS is spearheading the movement towards optimum health, performance and longevity for musicians around the world. GHS Handmaster Plus(tm) strengthens the 9 muscles that close the hand, as well as the 9 muscles that open the hand - all in one easy, continuous exercise. The result is maximum speed, strength and range of motion. Put an end to muscle imbalance from repetitive gripping and finger flexion. GHS Handmaster Plus(tm) stands alone, bringing strength and balance to the hands, wrists and elbows of serious musicians. Fits all hand sizes.