Ergonomically designed structure, the hand strengthener grip is designed to perfectly match the shape of your fingers, allowing you to train with a comfortable grip. Our wrist strengtheners are made of high strength plastic and carbon steel springs for even force and durability. Avoid the problem of handle or spring breakage during exercise. Grip Strength Ideal for finger, wrist and forearm training to enhance hand strength, increase grip and finger dexterity. Great for wrestlers, athletes, musicians, rock climbers, golfers and tennis players, muscle builders, sports coaches.