Finger Exerciser 1 or Finger Exerciser 2. Independent adjustable wrist strap, easy to use and operateAdjustable nylon hook and loop strap for tight closure, which is not easy to fall off. Three tension for different training usage, including 6.6LB, 8.8LB, 11LB,13LB, 17LB, 21LB, to exercise hand musc..