Designed to develop and maintain the strength and dexterity of your fingers and hands, the VARIGRIP’s ergonomic design and variable tension provides customized conditioning for each individual finger as well as the entire hand, wrist, and forearm. The reversible molded grip even uncovers simulated strings to help develop and maintain finger calluses when you are away from your instrument. D'Addario Varigrip, the ultimate conditioning tool for musicians.