CanDo Digi-Extend Exercisers, Set of 4 w/ Metal StandCanDo Digi Extend Exercisers, Set of 4, 56 Bands Total w Metal Stand (20 Tan, 16 Yellow, 12 Red, 8 Green) The key to better finger health sits in the palm of your hand. Designed to develop isolated finger strength, flexibility and coordination, the Digi Extend is a unique therapy device that isolates the extension of all five fingers and each of the individual finger joints. Not only for fingers, the Digi Extend also builds hand and forearm strength