Glass Boards
The surface is the selling point: nothing soaks in, so a glass board wipes back to clean indefinitely where a painted steel board ghosts within a year or two of daily writing. Two things to confirm. Magnets only work if the panel has a steel backing, since glass itself is not magnetic. And glass reflects both light and sound, which matters in a bright or echoing room. See whiteboards, glassboard markers and acoustic panels.
