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Great for athletes, musicians and Physical Therapy. Provides a complete strength training solution for fingers, hands, wrists, and forearms. Promotes finger strength, flexibility, coordination and speed. Soft button cap makes it comfortable to press. The slim size makes you hold it all in one palm and make it portable to exercise your fingers in anytime at anywhere. Copper core, adjustable tension, make operation smooth and accurate. Features: Resistance adjustable from 3.0 - 8.5 lb on each finger, thereby allowing a single unit to meet all of your exercise needs. Precise design for spring structure with copper nut and screw. Visible physical force adjustment, you can see the change while you practice. Intensify your practice for specific finger with exclusive "key-hold" feature. 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 Widely used for finger exercise when you play guitar,piano or orchestral instruments. Specifications: Dimensions:105*66*23 mm Press Keys: 5 Adjustable Tension: 3 to 8.5 pounds Number of Piston Locks: 2 Net Weight: 110g