For the production of arched openings, various materials are used, however, it is on the type of material used for the manufacture of arches that their main spectrum of use depends. Consequently, products made of more durable materials, such as concrete, wood, brick, can be used both inside and outside the room, and arches from less reliable materials in particular products from plastic, gypsum, chipboard and fiberboard are intended only for the inside of the dwelling.