The Charleston Mailbox Address Plate is cast from aluminum and has black powder coating. The coating is the same that is used on industrial farming equipment. Your plaque won’t rust or tarnish from the elements. Addresses of Distinction was founded in 2005 and is the Southeast’s largest provider of residential mailboxes and street signs. With over 80,000 installations under our belt, it is clear to see why so many neighborhoods turn to Addresses of Distinction for a long-term solution to their street sign and mailbox needs. The manufacturer, Addresses of Distinction, includes a 1-year warranty with your purchase.