Our Kingston Curbside Mailbox has universal appeal with this smooth geometric styling accented with a simple decorative embossing. The low profile belies the spacious interior. The Kingston, like all of our mailboxes, is manufactured from rust-proof cast aluminum. The Main Street Mailbox Post features a 4? x 4″ square post with sculpted corners and accent flutes for a unique look. Made entirely of Aluminum with Stainless Steel components to eliminate rusting. Direct Burial installation required.