FenceMaster 3 ½” x 3 ½” PVC Vinyl Railing T Rail, made of PVC as the main raw material, by high temperature and high pressure extrusion processing. The formula is environmentally friendly, lead-free and has excellent UV resistance. Thewall thickness of this T rail is 0.11″, durable, reliable quality. FenceMaster has accumulated almost two decades of experience in the PVC extrusion industry to ensure that our products bring more value to our customers.