Our large solid cast Aluminum cast post style surface mount address sign features permanent, raised white reflective letters/numbers on a durable, baked satin black background. Lettering/numbers are maximum 1 line up to (5) 3 inch characters which is cast on both sides of the address sign. The address sign itself is 11.5 inches wide by 4.5 inches tall. these are forever rust free and quite suitable for indoors or outdoor, use this post address sign anywhere. These are great address signs for poles, porches, barns and more places around you home than you can imagine.