HiHiLL Hand Grip Adjustable Forearm Strength Training Range from 20-88Lbs (10-40Kg), 7 Resistance Levels (HGP-01) Practical Necessary: designed for improving strength, power and speed in the wrists, fingers, forearms, hands, and helps to relieve stress. Ideal for athletes, musicians, pianists, rock climbers, golfers, bodybuilders, tennis players and more Rubber Ergonomic Handle & Non-slip Gripper: The Ergonomic handle and its non-slip gripper fits well for all hand sizes, perfect for men and women, seniors and teens Adjustable Accurate Resistance: The adjustable dials could be adjusted from 20-88Lbs (10-40KG) just by screwing in or screwing out the knob just like the right picture shows Durable & Stainless Steel Springs & Solid Steel Hinges: Strong stainless steel extension springs and solid steel hinges both build a perfect hand grip strengthener for your daily training for long time Work Great for Rehabilitation: works great for rehabilitation. It's a perfect training gripper if you suffer from rheumatoid arthritis, carpal tunnel, tendonitis, tennis elbow or just right on the way to recovery from a fractured or broken wrist, or tendon surgery