The white mailbox post system patent pending is constructed of high-quality commercial-grade vinyl extrusions. The assembly is fast and simple with an internal key system that holds the arm firmly in place. All hardware is included even the bolts that attach the mailbox to the mailbox mounting plate. The quality vinyl extrusions, caps, and accessories will not yellow or deteriorate and we guarantee it. The post comes fully in length for direct burial so that your system will remain level for many years to come. 4Ever Products do not use wood anchors or other types of stakes that will rot and eventually become unstable.