"Adjustable Resistance- The adjustable resistance range of the hand clamp is 22-110 pounds (10-50 kg), allowing you to adjust the resistance to suit your ability and increase the value as you gain strength. This can all be done easily by turning the small black dial.Ergonomic Design- The grip strengthening non-slip rubber handle can well prevent it from accidentally slipping out of your hand when sweaty and wet. Suitable for men, women, old and young.Practical and Necessary- Grip training is great for improving the strength, power and speed of fingers, palms, wrists and forearms, helping to relieve stress, and is perfect for musicians, pianists, climbers, golfers, bodybuilders.Durable- The handle's sturdy stainless steel spring and solid steel hinge provide the perfect handle for your long daily exercise, whether at home, on the go or in the office, our finger sleeves are an ideal companion.High-quality Materials The grip strengthener is made of non-slip soft rubber and high-quality stainless steel springs, which is sturdy and durable. Reinforced Handle The ergonomic soft handle is comfortable to hold and will not hurt your palm."