This 2000 ~ 2006 GMC Yukon XL running board is made of O.E. grade blow molded ABS virgin plastic resin. The Final product is lightweight, durable, withstands extreme temperatures, and is O.E. certified. Made in a state-of-the-art factory that is ISO 9002 and QS 9000 certified. Will not chip or crack like fiberglass. All running boards include both driver's and passenger's side running boards and comes with necessary mounting brackets for installation. Professional Installation Recommended.