Finger Exerciser (1201) Features Light weight, pre-molded, sliding framework with an ergonomic curve for seating thumb base. Simple-to-use, power-graded springs (3 pairs) of elongation strength (load required to increase the length of spring by 100% of its rest length) - 5 Kg (white), 7 Kg (yellow) and 9 Kg (green). Instructions Identify 'U' shaped curve of the frame part as the side for thumb holding. Start the finger exercise by loading the framework initially with tw white springs (5Kg load strength), followed by yellow (7Kg) & then Green (9Kg) pairs of springs.