This hand grip strengthener Features adjustable resistance, great for improving the strength of your wrist, fingers, hands, and good for muscle building. Features: 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: PP + TPR Color: Black / Blue / Grey / Black & Red (optional) Size: 15 * 9.4cm / 5.9 * 3.7in Package Size: 16 * 10 * 2cm / 6.3 * 3.9 * 0.8in Weight: 155g / 5.5oz Package List: 1 * Hand Grip Strengthener