Maximizing wall space, this horizontal sliding unit allow the use of up to four sliding and one stationary marker board in the same amount of space as one traditional board. Premium vitre steel porcelain marker Board travel on nylon top mounted roller tracks, ensuring smooth mobility. Board are then held fast in place by bottom mounted guide bearings. Constructed with durable heavy gauge aluminum trim and an anodized protective finish this marker board is built to last. Premium vitre steel porcelain marker Board. 1/4" Thick natural cork posting surface. Heavy gauge aluminum trim and anodized protective finish. Up to four horizontal sliding units and one stationary unit. Standard units feature porcelain on steel marker Board and chalkBoard. 4 Track Units. Size: 4' H x 8' W.- SKU: AARC4599