The spring-grip dumbbells completely designs according to person's hand shape, the use time-sharing is single-handed, both hands, on grasp, get down grasp, and so on different exercise method. Has the volume small and light, carries conveniently, when use any limit, as necessary cannot exercise your hand vigor, alleviates wearily, uses the muscle to be solid, the strong muscle, the enhancement blood circulation, the long-term use, to prevents the rheumatism arthritis and so on to have the help, is exercises the healthy body the necessary small instrument. It specially suits the old person, the child and the woman.