Adjustable Finger Trainer/Exerciser For Hand Strengthening Of Any Guitar, Bass, Woodwind, Brass, And Percussion Instrumentalists ADJUSTABLE WEIGHTED VALVES DICTATES PRESSURE: Decide to use anywhere from 4lb to 7lb of pressure to promote progress in both strength and finger dexterity. Simply turn the tension rings at the bottom of each valve to your desired tension per finger. RUBBER GRIPS FOR PALM AND FINGER SUPPORT: Synthetic rubber on top of the finger tips and palm base provide security to the hand so no matter the tension, you're bound to have a secure grip while exercising. DEVELOPS FINGER, HAND, AND FOREARM MUSCLES: tendons and muscles both in the hand and forearm are incredibly important factors in the health and wellness of a musician. No matter whether you're a guitar player, trumpet player, violinist or clarinet player, virtually every musician can benefit . DURABLE CONSTRUCTION AND DESIGN: This finger exerciser is a simple, yet fantastic tool that will hold the test of time. High tension springs coupled with the highest attention to manufacturing detail will bring you years and years of support and workout gear 100% MONEY BACK GUARANTEE: If for whatever reason you don't love your finger exerciser, simply return it for a full refund.