Durable Mail Posts: We use 100% high-grade Polyethylene resin in the manufacturing process, which makes our products durable, lightweight and highly shock resistant. - Four Season Use: These posts are used for outdoor applications year-round, as they are resistant to high impact, chemicals and extreme weather conditions. This product stands true to its 'four-season use' tag with very little winter preparation. - Long Lasting Quality: The resin used to create our products contains built-in UV inhibitors that reduce the damaging effects of the sun. This ensures that your product doesn't fade, preserves its color and increases its overall lifespan. - Easy to Use: Unique New England styled product offering the timeless charm of the East Coast, installs easily over a standard 4×4 wood post. - Compatibility: Medium mailbox recommended, minimum 6 1/2 inch width. Holds a mailbox up to 12lbs. - Packaging: The Signature Plus Mail Post ships in 2 boxes (standard post MP5802 / arm MP5808). It includes the necessary hardware pack and instructions. Note: 4×4 wood post, mailbox, and mailbox mounting hardware NOT INCLUDED. - The Mayne Advantage: Mayne offers a 15-year residential warranty or a 5-year commercial warranty on this mail post. Mayne has been the top choice by the home and gardening sector in North America for over a decade.