SUNVP Hand Grip Strengthener Strength Trainer Adjustable Resistance 11-44 Lbs Exerciser Non-slip Gripper for Athletes Pianists Kids This tool is constructed to be durable and offers users a top quality design with stainless steel tension springs, comes with adjustable dial that can be adjusted from 11 to 44 pounds (5-20KG); Non-slip handles covered with soft, comfortable and durable rubber for frequent and comfy usage; SUNVP hand grip strengthener is ideal for improving strength, power and speed in the wrists, fingers and forearms. Ideal for athletes, musicians, rock climbers, golfers and tennis players; Hand grippers also work great for rehabilitation. If you suffer from rheumatoid arthritis, arthritis, carpal tunnel, tendonitis, tennis elbow and are on the way to recovery from a fractured or broken wrist, or tendon surgery, then this is the perfect gripper for you; Ergonomically designed and it fits well for all hand sizes, perfect for men and women, seniors and teens.