Main materials are stainless steel woven mesh, stainless steel sintered felt, phosphor bronze wire, brass wire, aluminum foil mesh. Shape into round, kidney-shaped, rectangular, circular, elliptical and so on. The material layers are single-layer, multi-layered. Wrapping materials: aluminum, stainless steel, galvanized sheet, titanium, rubber and other special materials. Filtration, size can be made user needs