The Handmaster Plus hand exerciser provides musicians a complete hand and finger workout that is both convenient and easy to use.The Handmaster plus hand and finger exerciser concentrate on both strengthening the flexor (squeezing) muscles PLUS the extensor (opening) muscles of the hand. This exercise strengthens all nineteen muscles of the hand in one simple, continuous motionThe Handmaster plus exerciser produces a strong balanced hand with the benefit of also being a wrist, forearm and fingers exerciser. Thus, the performance potential and stamina of all types of musicians are increased and future injury potential is decreased