For the past 30 years, ‘grip-only’ finger, hand and wrist strengthening equipment (i.e. coiled & spring-loaded grippers, grip rings, stress balls, etc.) have dominated the grip training market, yet they are incomplete mechanically – strengthening ONLY the muscles (9) that close the hand… leaving the user open to chronic repetitive grip imbalance, weakness, cramping and joint instability. The classic ‘rice-box’ was an excellent exercise as it successfully brought strength AND balance to the muscles of the hand, wrist, carpal tunnel & elbow. BUT IT WAS TOO BULKY TO CARRY AROUND! ‘Elastic bands & exercise putty’ do not allow true full ROM training… and are too time consuming to reposition and reload. Handmaster Plus easily combines the mechanics of strength and balance in one complete, convenient, easy to understand hand exerciser.