The 5" system top rail measures 8 feet in length. It is precision molded and reinforced at the core with heavy-duty vinyl, which enriches the 5" balustrade with superior strength and structural integrity. The 5" top rail compliments all baluster styles within the system and becomes a versatile addition to porches, patios, balconies, decks, and more. The 5" system top rail is crafted in durable urethane, a molded polymer material that possesses a beneficial closed cell structure that locks moisture out. Urethane rails are resistant to the moisture that can cause warping, splintering, peeling, staining, mildew and rotting. In addition, they do not offer a food source for insects.