A Trex Transcend Post Sleeve slides over a 4×4 wood post or structural post to create the foundation of a Trex Railing System. Posts are the components of a railing system in which the rails are attached to. Two posts are required per each railing section. Trex Posts are made of composite and measure 4.45 inches x 4.45 inches x 39 inches. They can be used with all Trex Railing Systems, including Transcend, Select and Signature Railing. A Trex Post Sleeve is typically used to add aesthetic appeal to a railing system or in order to have railing match a Trex Deck.