• Easy resistance adjustment from 10 to 130LBS, equipped with a robust 6 mm compression spring that ensures safety and durability • High-quality ABS material, withstands up to 100,000 squeezes without breaking • Ergonomic design provides a comfortable grip, suitable for any hand size • Effectively trains the muscles of the fingers, palms, and forearms, improving grip strength, manual dexterity, and muscular endurance • Suitable for rehabilitation and recovery, helping restore hand functionality after injuries or surgeries • Compact and portable, ideal for training anytime and anywhere: home, office, car, gym, or library • Includes a comprehensive training guide with 11 exercises and 7 scientifically designed training plans • Targeted at athletes, fitness enthusiasts, office workers, rehabilitation patients, and seniors • Designed to suit all experience levels and training needs