Kootek Hand Grip Strenghthener with 5 Resistance Levels ( 50-75-100-125-150 Lbs ) Adjustable Strength Trainer Arm Exerciser Workout Non-slip Gripper for Athletes Pianists Kids Kootek hand gripper is ideal for strength training, improving muscle strength and flexibility of wrists, forearms and grip strength of fingers. Ideal for athletes, musicians, rock climbers, golfers and tennis players. Hand grip exerciser also work great for rehabilitation. If you suffer from rheumatoid arthritis, arthropathy, tendonitis, carpal tunnel, tennis elbow and are on the way of recovery from a fractured or broken wrist, or tendon surgery, then this is the perfect gripper for you. Constructed to be durable and offers users a top quality design with aluminium alloy, comes with adjustable ring that can be adjusted to 5 different resistance levels (50-75-100-125-150 Lbs); How to adjust: Turn the fixing ring counterclockwise, slide the handle along the adjuster bar, then fix the ring at your expected resistance level. (Note: Slightly loosen the fixing ring is enough, no need to thoroughly loosen, if the resistance bar falling out of tube, please matching the semicircle hole then reinsert it.) Ergonomically designed, come with non-slip handles, it perfect for men and women, seniors and teens.