-SP001 hand gripper help to get your strength back This is a little exercise equipment for every day strengthening They train your fingers wrist and forearm effectively and relieve stress. PS: It also can be a nice little gift for Christmas stocking stuffers :) How to Use: You simply turn the knob to the exact setting you want and start. Grippers gesture include single hand double hand gripping up/down the gesture varies up to your practicing purpose. Last 5 seconds after grip tight 20 constant repetitions once would be more effective. Insisting on daily use believe your hand should be more ambidextrous symmetrical and balanced. Specifications Material: stainless steel & rubber Resistance range: 22-88 lbs (10-40kg) Size: 6 x 3.4 x 0.8inch Weight: 5.3 ounces GOOD WORKOUT HELPER for athletes musicians rock climbers golfers and tennis players etc. to improve strength and flexibility of the wrists fingers and forearms through daily exercising. REHABILITATION TRAINING HELPER for those who have lost strength due to arthritis carpal tunnel or those who suffer from tendinitis tennis elbow or may be on the mend from a fractured or broken wrist or tendon surgery and so on. ERGONOMICS DESIGN WITH A STYLE non-slip rubberized handle for comfortable holding average size to fit most of people including men women seniors teens. DURABLE CONSTRUCTION GOOD QUALITY strong stainless steel springs for more durability Tension adjustable from 22 to 88 pounds (10-40KG) for starter and advance use. COMPACT AND PORTABLE 5.3oz 6 x 3.4 x 0.8inch easy carrying and use.