This 5-pack grip strength trainer kit is designed to improve hand, wrist, and forearm strength through adjustable resistance training. Each hand gripper features a durable and ergonomic design, making it suitable for beginners as well as advanced users looking to enhance grip power and endurance. With an adjustable resistance range from 10kg to 60kg, the tension can be easily customized using the rotary adjustment knob, allowing progressive training based on your strength level and fitness goals. This makes it ideal for building strength gradually and effectively.