This hand grip strengthener Features a counter and adjustable resistance, great for improving the strength of your wrist, fingers, hands, and good for muscle building. Features: Smart counter records your exercise numbers to track your training progress, no battery required. Gently rotate the bottom button to clear units digit, push and rotate to clear tens digit. Adjustable resistance from 5kg to 60kg (11lb - 132lb) as needed. Ergonomic soft TPR rubber handle provides a comfortable, nonslip grip. High-strength plastic frame with stainless steel spring for long-lasting durability. Help improve the strength and flexibility of forearm, wrist, finger, hand, and muscle building. Specifications: Material: Plastic + TPR Color: Black / Green / Light Blue / Pink (optional) Size: Approx. 15 * 10cm / 5.9 * 3.9in Weight: 153g / 5.4oz Package List: 1 * Hand Grip Strengthener