Grip Strengthener / Hand Exerciser: Perfect for Improving Grip Strength & Finger Strengthening. 100% Satisfaction Guarantee. Intuitive finger trainer, ergonomic anti-slip design, pick up and use for finger exercise, no training required High effective hand strengthening with variable resistance that is easily changed by twisting the front knob. Get superior grip strength. Finger strengthener use for rehab to strength training finger exerciser, suitable for arthritis (rheumatoid or osteo), tendonitis, carpal tunnel, tennis elbow and those recovering from a broken wrist and tendon surgery. Even musicians like guitar, violin, banjo, ukulele and piano players can benefit Custom made with fatigue resistant stainless steel. Lab tested to 10,000 open and close cycles with 0.1% failure rate out of the factory. Satisfaction is guaranteed, you will never need to buy another hand gripper. If it breaks, we replace, simple and headache free Among the best grip trainer on the market, whether you need finger strength, a premium yet comfortable hand exerciser, this is all you need.