MAKE IT EASY ON THE HAND with TENSION-DIAL Resistant Technology! Add as much or as little resistance as you’d like with a comfortable resistant range anywhere from 20 to 90 lbs. The Perfect  Gripper, whether you suffer from rheumatoid arthritis, carpal tunnel, tendonitis, or tennis elbow: SHAKE YOUR NEXT HAND WITH ATITTUDE – Coined as the unofficial hand squeezer machine, This device is ideal for improving strength by performing exercises targeting your hands, fingers , wrists and forearms to improve strength.