The Mayne Charleston Mail Post brings East Coast style and curb appeal. This plastic post cover goes over a standard 4- x 4-inch post to create a classic look. It's built from molded heavy-duty polyethylene with UV inhibitors to protect your choice of color, and includes a large decorative post with inset panels and an arched mailbox support arm. A small mailbox is recommended, weighing less than 7 pounds. Use a 4- x 4-inch post at least 84 inches high.