The grip device is designed according to the shape of human hands, and adopts different exercise methods such as one hand, two hands, upper grip, lower grip and double clamp. It is small and light, easy to carry, and it is not restricted when used. It can exercise your hand strength at any time, relieve fatigue, strengthen muscles and enhance blood circulation. Long-term use will help prevent rheumatoid arthritis. It is an indispensable small instrument for sports and fitness.