1、Ergonomic Design: Designed with human ergonomics in mind, our grip strength trainer ensures even pressure distribution for a comfortable workout. 2、Adjustable Resistance: With a resistance range of 5-165KG, this trainer is suitable for everyone from students to fitness enthusiasts. 3、Dual Spring Design: Our trainer features a dual spring design for added durability and longevity. With an adjustable resistance of 5-165KG and a grip width that can be easily adjusted between 55 and 100mm, this trainer is perfect for climbers, tennis players, athletes, and musicians looking to improve wrist, finger, and forearm strength. The bottom rotating button allows for quick and easy resetting of the counter, which displays the number of rotations from 0 to 99. Features: Ergonomic Design: Designed with human ergonomics in mind, our grip strength trainer ensures even pressure distribution for a comfortable workout. Adjustable Resistance: With a resistance range of 5-165KG, this trainer is suitable for everyone from students to fitness enthusiasts. Dual Spring Design: Our trainer features a dual spring design for added durability and longevity. Carbon Steel Counting: The built-in carbon steel counter displays your workout progress clearly and can be easily reset. Versatile Use: Perfect for climbers, tennis players, athletes, and musicians looking to improve wrist, finger, and forearm strength. Specifications: Material: Carbon Steel + Nylon Resistance: 5-165KG Grip Width: Adjustable between 55 and 100mm / 2.2 and 3.9in Color: Red/Black（Optional） Spring Design: Dual Spring Size: 13.4*16cm / 5.3*6.3in Weight: 400g / 0.88lb Packaging Size: 16.5*13.8*3.5cm / 6.5*5.4*1.4in Packaging Weight: 440g / 0.97lb Package List: 1 x Adjustable Hand Grip Strength Trainer 1 x Adjustable Hand Grip Strength Trainer