Glass is the finest dry erase surface available today. It never ghosts, cleans easily and is perfect for extensive use. This ultra-modern 18in x 24in opaque glass board features square corners with a pass through mounting system that makes installation easy. The 4mm tempered glass surface is compatible with high intensity magnets. Works with wet erase and dry erase markers. Mounts vertically or horizontally and features a lifetime surface warranty. Perfect for offices, training environments, meeting rooms and more.