When you are purchasing, you should pay attention to the surface gloss which has no glitches when hand touch and has no holes and oxidation spots and so on. The general quality for the faucet body is casting by copper which is after forming grinding and polishing, the surface acid copper is plating, then is nickel and chrome; ordinary products are generally only nickel and chrome. Regular coating products have specific technical requirements, and through the neutral salt spray test, within the time limit without corrosion phenomenon. Therefore, product quality faucet tight structure, coating uniformity, color smooth and delicate, long use can keep bright as new.