Unsurpassed in performance and durability. Centurion magnetic markerboards are built to last and carry a fifty year guarantee. Centurion's porcelain-on-steel surface is the hardest market surface available and will resist scratching, denting or staining. Due to its steel substrate, Centurion markerboards accept magnetic accessories. Aluminum frame, 1/4" hardwood backing. Measures 4'H x 6'W. Item MIX-46-4 See other Dry Erase Markerboads.