Projects for health, balance and enjoyment. Handmaster Plus is a complete hand strength & performance solution in all grip sports, music, workplace and hobby environments. Repetitive grip is to the hand, wrist carpal tunnel & elbow what 'bad posture' is to the spine. Bad. But easy to prevent. 9 muscles close the hand & 9 muscles open the hand. All muscles contribute to grip and performance and stability. Keep them balanced.