Steel sreen mesh is the protection and decoration part of the speaker. It can not only protect the internal structure of the speaker, but also give people an artistic beauty. At present, the speaker mesh is mainly divided into three categories: steel mesh, aluminum mesh and plastic mesh, steel mesh and aluminum mesh. The pore size is generally 0.8, 1.0, 1.2, 1.5, 2.0, etc.; the surface treatment is generally painting, electroplating or PVD, etc., and then stamping and forming, which is widely used in electrical appliances, communications, automobiles and other industries.