CanDo® Digi-Squeeze® hand exerciser is a hand-held foam exercise ball for squeezing that helps develops isolated finger strength, flexibility, and coordination for rehabilitation of carpel tunnel, arthritis, stroke, fractures, tendon injury, nerve lacerations, tennis elbow and more. The ball comes with exercise pamphlet and is available in three different sizes  for small, medium, and large hands, and 5 different resistances. Each ball has finger and thumb positioning indents and markings for both left and right handed use. 

Also available in :

CanDo® Digi-Squeeze® hand exerciser - Medium - green, moderate

Video : Digi Squeeze