This Screen Tight 3-1/2 in. x 96 in. Porch Screening System Base Strip features low-maintenance vinyl construction in a black color that does not need to be re-painted. The base strip also resists UV rays, perfect for prolonged exposure to the sun outdoors. The strip can be installed in either 2 in. x 4 in. or 4 in. x 4 in. frame construction to suit your porch style and features dual splines for easy screen installation.