Exercises the forearm, wrist, and fingers Builds the flexor and extensor muscles and improves grip strength, Provides forearm and wrist support for maximum safety and comfort, Variable resistance allows you to measure your progress. Offers Strong Reistance. Resistance Adjustable from 9kg – 11.5kg. Using This Terminate weakness in your forearms, fingers, and wrists Also increases Forearm Size. You will See and Feel Results After First Use.