... FreelyMaterial:-Surface: Dark green magnetic steel board or white magnetic steel board. POSCO (Import from Korea) and ... mainland) board available.-Interlayer: High-strength corrugated board (7 layers).-Bottom board: Zinc coated board-Corner: ABS Engineering PlasticAccessory:- Erase, Magnetic ... skid, no-deformed, Wearable, Washable.- Magnetic steel board surface can use magnetic cobs, to avoid the self ...