Chemical Etching Material: Stainless Steel, Middle Steel, Copper, Aluminum, Brass Our Photo Etching Process can be performed on practically any types of metal including very thin metal sheets with dimensional tolerances requiring micro precision and offers part manufacturers advantages in several ways. We anticipate still widening areas of its applications in the near future. Package: outside with woven cloth inside with plastic then out side with hessian cloth Usage: Oil, chemicals, food, pharmaceutical use sophisticated filters, filter plates, filter cartridges, filters; Electronic Industry Leakage metal plate, cover, flat pin, lead frame, metal substrate; Optical precision machinery and plane parts, parts of spring; Other create advertise board, trademarks and fine crafts.