Sunny Health & Fitness Adjustable Hand Gripper Features an adjustable Dial tension knob to ensure a customizable resistance level of 22 to 88 lbs of pressure Built with heavy duty steel coil spring that endures long-term frequent Use Ergonomic foam-molded handle guarantees optimal grip and comfort; designed to fit hands of all sizes Ideal for grip strengthening, physical rehabilitation uses and relieving stress increases hand, finger, wrist and forearm strength