Designed with the musician in mind, the D'Addario Varigrip is an adjustable tension hand exerciser that helps improve dexterity and strength in your fingers, hands, and forearms • Develops and maintains the strength and dexterity of your fingers, hands and forearms • Variable tension provides customized conditioning for individual fingers • Reversible molded grip uncovers simulated strings to help develop and maintain finger calluses for string musicians • Perfect tool for pre-show warm-ups and maintaining conditioning when away from your instrument • The ultimate conditioning tool for all musicians