Box Design modern mailboxes have stood the test of time. Our Urban and Rural modern mailboxes are available in a silver pearl zincalume casing, black powder coated zincalume casing, or a 316 marine grade stainless steel casing. The zincalume casing combines the corrosion protection of aluminum with the sacrificial protection of zinc, giving the advantages of both metals. Our Metro and Wall Mount modern mailboxes are made of a 2mm aluminum powder coated silver pearl casing. Box Design modern mailbox doors are made of an ACM (aluminum composite material) designed to be immuned to changing weather. Our modern mailbox posts are available in a standard or robust silver powder coated steel, black powder coated steel or a solid stainless steel post.