Hand Grip Strengthener Adjustable Hand Exerciser - 100% Quality Tested - Easily Adjust Resistance from 10-40kg (22-88Lbs) - Spring Dia 2.85mm No Gimmicks. Just Superior Design and Workmanship with a 100% LIFETIME GUARANTEE! 100% Money Back Guarantee When You Purchase Today! EACH and EVERY Unit is hand inspected by US to insure QUALITY and SMOOTH OPERATION! Outstanding Design and Workmanship with Molded Soft Handles Global Goody Hand Grip Strengthener and Exerciser has a Large Easily Adjustable Tension Dial. Number One Choice for people strengthening fingers, hands, wrists, forearm and elbow or who have Arthritis, Rheumatoid Arthritis, Tendonitis, Carpal Tunnel, Tennis Elbow or Recovering from a Broken Wrist and Tendon Surgery The Ergonomically-Designed Handle Has a Grip of Sturdy, Comfortable, No-Slip TPR (Thermoplastic Rubber) with a Strong Durable 2.85 mm Diameter Steel Spring that is Built to Last Perfect for Athletes and Outdoors-men Who Want to Increase Hand, Wrist, Forearm and Finger Strength for Racket Sports, Baseball, Football, Golf, Shooting, Bodybuilding, Climbing etc.