Green Lion Grip Master Hand Grip Strengthener aids in enhancing grasp strength and developing hand endurance. It is manufactured of durable PP + TPR + Steel materials with a high-tension spring providing resistance from 5 to 100 kg, suitable for all strength levels. A rotary knob can be adjusted to change resistance easily; furthermore, a digital counter keeps an accurate count of repetitions to motivate anyone during exercise. It is powered by an LR1130 battery. The counter will keep the feedback of your actions and progress, therefore, helping you to improve. The four-finger molded spiraling handles offer comfort and security while holding, alongside its sturdy construction, making it a perfect entrant for home, gym, or travel. Whether it is strength or rehabilitation, Green Lion Grip Master will develop and maintain hand and forearm strength fast and efficiently. Specification Material: PP + TPR + Steel Resistance Range: 5-100kg Counter Type: Digital (LR1130 Battery) Features High-Tension Spring Rotary Knob Adjustment Portable & Durable Tracking Motivation Digital Display Four-Finger Molded Grip Built-in Counter