Unsurpassed in performance and durability. Centurion porcelain-on-steel markerboards are the finest markerboards in the world. Specifically designed for everyday use. Centurion s porcelain-on-steel surface is the hardest marker surface available and will resist scratching denting or staining Due to its steel substrate Centurion markerboards accept magnetic accessories. Built to last Centurion markerboards with their fifty-year guarantee are the best value when measured over their years of dependable service. Frame: Frameless. Magnetic. Porcelain. Surface: Porcelain Steel. Surface Color: White. Size: 4 x 5 .