Trex Company, Inc. is a manufacturer of wood-alternative composite decking, residential 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 residential railing, and a leader in high-performance, low-maintenance outdoor living products. 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