Thumba loyimilirali limapangidwa ndi zigawo zingapo zazinthu zokhala ndi laminated, zomwe zimapereka zotchinga zabwino kwambiri kuti ziteteze zomwe zili ku chinyezi, mpweya, ndi kuwala.Zida zomwe zimagwiritsidwa ntchito zingaphatikizepo mafilimu apulasitiki, zojambulazo za aluminiyamu, ndi mapepala, malingana ndi zofunikira za mankhwala.