Quality craftsmanship and attention to detail makes the Providence Mailbox Post an outstanding addition to your property. Made solely of a cellular-PVC (Vinyl) and stainless stell fasteners, they are made to stand the test of time. – Made from a rot free cellular-pvc trim & stainless steel fasteners that will stand the test of time. – Post measures 4″ sq x 60″ high – Accomodates most standard & large size mailboxes – Made to fit over a Pressure Treated 3×3 (included).