Plastic Lumber Outdoor Message Centers are built to last. The Plastic Lumber material is weatherproof, durable and available in five attractive colors. It is also environmentally friendly in that it is made from recycled material. They can be easily mounted to walls or you can choose the optional matching posts for free standing applications. All Letter Board models come complete with 1 Free set of 3/4″ Helvetica Letters and assortment tray. Hinged Door models are available with either changeable letter panels or vinyl covered cork tackboard surface (custom colors available). The doors are sturdily attached with full length piano hinges and include locks to secure them closed.