The white vinyl Post Mounted Mailbox post system (patent pending) is constructed of high-quality commercial grade vinyl extrusions. The numbers for the number plate are not included. The assembly is fast and simple with our 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 4Ever Products guarantees it. This 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 the stake that will rot and eventually become unstable.