Varigrip. Designed to develop and maintain hand and finger strength, condition and dexterity, the Varigrip’s ergonomic design and variable tension provides customized conditioning for individual fingers, the entire hand, wrist, and forearm. The reversible molded grip uncovers simulated strings to help develop and maintain finger calluses when you are away from your instrument. The Varigrip offers all-in-one hand fitness and is designed by musicians for musicians.