Yougle Adjustable Hand Grip Gripper Strengthener Training Forearm Muscle and Finger Strength Exerciser Developer Adjustable Resistance Range 22 to 88 Lbs (10-40 Kg) Fits conveniently in your pocket, purse or gym bag Ergonomic design to fit small through large hand sizes Superior Design and Workmanship with Molded Foam Handles and a Strong Durable Spring that is Built to Last Ideal for Athletes and Sports Enthusiasts Who Want to Increase Their Hand, Wrist, Forearem and Finger Strength for Rock Climbing, Shooting, Bodybuilding, Golf, Tennis etc