The Access roll top, Literider, Limited and Lorado tonneau covers have bows and rear rail that are attached to the cover. No loose parts that can be lost out of your truck bed when the tonneau cover is in the stored position behind the cab of your pickup truck. The cover is made of a heavy duty, double coated reinforced vinyl with a black textured finish. Provides good looks and security from prying eyes. Studies show tonneau covers improve gas mileage by five to ten per cent.