Shark Grips Adjustable Hand Grip Strengthener, Resistance Range 22 to 88 Lbs for Exerciser Hand / Finger / Forearm Strength Training. Rehabilitation for Arthritis, Tendonitis and Tennis Elbow STRONGER FOREARMS AND GRIP  By increasing your forearm strength you increase your grip strength which will directly lead to bigger gains in the gym. Dont let your forearm strength keep you from reaching your maximum potential in the gym. ADJUSTABLE RESISTANCE  Gives you the ability to increase your resistance as required as you get stronger. You can start at a level comfortable to you and build from there. ERGONOMIC DESIGN  These grips are designed for all sizes of hands (male or female), the rubber grip on the handle gives you a non-slip surface for a secure grip. REHABILITION FROM INJURY  Great way for people to rehab the following ailments: arthritis, tendonitis, tennis elbow, rheumatoid arthritis, and carpal tunnel syndrome. 100% SATISFACTION GUARANTEE AND LIFETIME WARRANTY - We're so confident in our product that if you're unsatisfied we offer a No-Questions-Asked 100% Money Back Guarantee