... standards. XIAMEN BLESSING GLASS WHITEBOARD-Magnetic Glass Dry erase WhiteboardProduct Performance Indicator1. Hardness :> 3 ... layer even & not opaque;6,No damaged rim defects, whose dia. will be over 0 ... .3mm, on the corner, rim and hole while processing7,Zinc plated metal ... allowed. XIAMEN BLESSING GLASS WHITEBOARDMagnetic Glass Dry erase WhiteboardAccessories: Markers Pen,Magnetis,Installation ...