CD is the abbreviation of English Code Division, and the Chinese meaning is "CD". CD pattern is a kind of effect similar to that of CD disc obtained by using a precise CD pattern machine to remove material on the metal surface. Its pattern spacing is based on the appearance of the product. The size depends on the effect. (What is the CD pattern, there is no clear definition in the industry at present) It is recognized in the industry that the CD pattern is a higher-grade surface treatment process for metal surfaces.