DIGI*FLEX Hand and Finger Exercise System- 5.0 lbs. Resistance, Green- Develops isolated finger strength, flexibility and coordination as it builds hand and forearm strength. Stronger digits can no longer compensate for weaker ones, as each finger is appropriately challenged on its own spring-loaded button. Calibrated springs provide a quantitative tool for evaluating progress. Ergonomic base conforms to the palm, correctly positioning the Digi-Flex in the hand to distribute pressure evenly. The three-spring palm bar works with the finger buttons for gross grasp exercises. Latex Free.