Made of rust-proof cast Aluminum . Powder coated to give it a chip-proof, fade resistant color . 1-Year warranty . Assembly required . 20 in. L x 8.75 in. W x 15 in. H (18 lbs.) The traditional shape of our Classic Curbside Mailbox is the only thing this mailbox has in common with a standard hardware store mailbox. The solid cast Aluminum construction, with 20% thicker walls than our competitors, provides added strength, and the powder coated finish will maintain a lifetime of beauty.