It is mainly divided into two categories. One is the flat net set on the horizontal plane. Generally, nylon rope is compiled. The mesh thepex is larger, sparsely distributed, and has a certain strength. It is a vertical net set on the facade of the building. Generally, polyethylene monocular wire is prepared. The pores of the mesh are small, the distribution is fine, and the intensity requirements are lower than the flat net. Or the object is dropped, and at the same time, it plays a role in dustproof, sound insulation, and aesthetics.