Built-in UV inhibitors that ensure it does not fade easily Designed to hold a medium or large mailbox weighing up to 16lbs Manchester mail post ships in 2 boxes With its fluted post design, detailed molding around the cap, and scrolling curve on the support arm, the Manchester Mail Post is a lightweight, whimsical alternative to traditional mail posts. This mail post is made from 100% high-grade Polyethylene, is weatherproof and has an ultra-tough construction. The mailbox support arm is designed to hold a medium or large mailbox weighing up to 16lbs. It is available in Black, Graphite Grey and White. Durable Mail Posts: We use 100% high-grade Polyethylene resin in the manufacturing process, which makes our products durable, lightweight and highly shock .