HINDAWI 11-44 Lbs Adjustable Hand Gripper Wrist Exerciser Strengthener Plastic Handle, Spring Carbon Steel, Anti-slip Structure ERGONOMICALLY: Fit Small to Large Hand Sizes. Perfect for Men, Women, Seniors and Teens FUNCTION: Increase Power for Hand, Wrist, Forearem, Fingers Strength etc FIT FOR: Rock Climbing, Shooting, Bodybuilding, Golf, Tennis, Recovering From a Broken Wrist and Tendon Surgery POWER RANGE: 11~44 LBs5~20KG, Great Fingers Strengthener for Musicians Including Guitar, Piano and Violin Players