Anyone shopping for office storage cupboards might be surprised to learn that they are now available in three different construction material types. These are glass, wood and steel. One might ask how could one possibly have a storage container made out of glass. While the entire unit itself is not glass, the top of the unit usually is made with a smoked opaque safety tempered glass. This is to allow a usable surface on top of the rest of the structure which is usually constructed of steel. Traditional wooden office cupboards remain popular primarily for their ability to match existing wooden desks and other storage.