Profile: Tangshan Hengguang Mechanical Parts Co., Ltd. is a manufacturer of auto coil springs, compression springs, magnetic shock absorbers and coil overs. Coil spring is made of spring steel, can be made of constant stiffness of equal pitch or variable stiffness of variable pitch. Coil springs vary in wire thickness, number of coils and their density. A shock absorber is built into the spring, so that the body is separated from the road in some way and the car moves more smoothly on the road. A shock absorber is built into the spring, so that the body is separated from the road in some way and the car moves more smoothly on the road.