Replaces up to 4.75 – 7.5 lbs of tension per finger. The Varigrip’s ergonomic design and variable tension provides customized conditioning for individual fingers, the entire hand, wrist, and forearm. The reversible molded grip even uncovers simulated strings to help develop and maintain finger calluses. Set tension from light to hard individually for each finish, so if you’ve got weak pinkies, build them up to snuff.