houseables mailbox and post kit, decorative mail box included, white & black, 72" x 4", vinyl pvc plastic post & mounting arm, aluminum mailboxes, steel anchor, rust proof, for home, residence houseables what do you know about cast aluminum? curbside mailboxes are an attractive way of identifying the driveway of your home while giving you a cool vessel for your daily incoming mail (and alsosaving your local postal carrier a few steps in the process). there are many styles and constructions of mail posts out there but our sources tell us that cast aluminum offers benefits that like-shaped posts made from wood and steel lack. for starters, cast aluminum is obviously lighter. less weight means it is quicker to manufacture, easier to customize, and requires less (wo)manpower and time to assemble and erect. then there is the maintenance. cast aluminum is rust proof, which means there’s no chance that the post (or its various parts) will rust, or tarnish like cast iron or steel; or dry out, crack, and rot like wood, after prolonged exposure to sunlight, lousy weather, excess moisture, and salty outdoor air. all of this means better overall performance for your mailbox and less general maintenance for you in the end. this is obviously a good thing.