[MEDIUM SPRING COIL Features durable spring coils with medium-strength resistance for The perfect strength training equipment that is made to last. material] Our grip is made aluminum alloy handles and carbon steel springs. aluminum handle is sturdy and lightweight, making a durable exercise tool. [Portable Design] Our grip is very portable and can be easily placed in a bag or pocket. You can bring this grip to any place you want to exercise, and can turn your free time into effective exercise time. [Widely applicable] Grip strength devices are suitable for most people, such as athletes, athletes, fitness, bodybuilders, musicians, and people who want to exercise their wrists, and fingers. [STRESS RELIEF] Not just for grip strength - they also can help in relieving stress while improving strength.