Trex Company, Inc. is a manufacturer of wood-alternative composite decking, railing, and other outdoor items made from recycled materials. Headquartered in Winchester, Virginia, Trex is the world's largest manufacturer of wood-alternative decking and railing. Trex composite products are made of 95% recycled materials. In redirecting more than 400 million pounds of plastic and scrap wood from landfills each year, Trex is one of the largest plastic film recyclers in the US. Wikipedia