Cando 10-0745Hand exerciser SET - finger grip strengthener Digi-Flex®, SET of 5 pieces (1 per level of difficulty - very easy to very difficult),Yellow thru Black - 5 pc SetHand and finger training device for building up strength, mobility and coordination of individual fingers while increasing the overall strength of the hand and forearm Ideal for therapy and rehabilitation, but also for working out at home Available in 5 weights, which are labeled by colour: 0. 68 kg yellow, 1. 4 kg red, 2. 3 kg green, 3. 2 kg blue and 4. 1 kg black Also available in a set of 5 with or without display The resistance measurements are