5? Pro-Rite® Markerboards have an additional 1? of writing and viewing surface and the most durable, top-of-the-line writing surface available today. Made with a porcelain steel surface and 1¼" satin aluminum frame, these magnetic markerboards are backed by a 50-year warranty. Also available with Oak frame, call for details. 50-year warranty on porcelian steel surface. MARSH ORDERS TOTALING OVER $1000.00 SHIP FREE.