Coil springs G & M coil spring manufacturing process. Production at a high standard from the Netherlands. Iron Iron is a solid surface is called CHROME SILICUM STEEL is a steel of high quality. The specification. Color coating to the coil spring. Is a thin coating. Color is made of synthetic resin is very sticky. Even a thin coating. When the heat coagulation. Disintegration is not easy. Ensure the strength and durability on the verification process, ensure the production side of the coil spring structure of G & M with the ISO9001-2000 certification is accepted worldwide by TUV certificate addition to the factory coil spring. Processing and material well. Only are not enough. Moreover, when you touch the driving performance of a great flat with. Ensure perfect really. Whether it was the state Whichever path. 1 year limited warranty kilo