"Pipe and drape are composed of uprights, bases, crossbars and fabric drapes. Uprights are usually manufactured from aluminum that is usually lightweight but compact-resist. Uprights and bases are connected to make the structure stand up. Bases are usually made from steel that keep the whole structure stable. The weight of base varies a lot ranging from 6 to 62 lb according to real needs. Fabric drapes are usually made from flame resistant material. They are usually supported by crossbars which can slip into the rod pockets in the drapes. At each end of the crossbars, a hook is used to fix onto the slots of the uprights. " Details of "What Is Pipe And Drape"( the article link: http://www.rkpipeanddrape.com/Pipe_and_Drape/).