Cando digi-flex lite hand exerciser, black, x-heavy the cando digi-flex lite develops isolated finger strength, flexibility and coordination as it builds hand and forearm strength. Each finger button can individually lock. Each button has a single spring that is covered by plastic sheath. Use each button independently to exercise fingers or compress the entire unit for complete hand and forearm strengthening. Progressivecolor-coded resistance gives patient positive feedback. Black – x-heavy.