"Mungyo Glass and Board Chalk pens Features made in Korea Marks on any surface and any kind of board- - white or black dry erase board Easily Erased with wet Tissue or cloth Application Writes smoothly on glasses, windows, mirrors ,plastic - PP. PE.PS. Pet,etc Multi purpose use-home, school, college, events, office, bars/restaurants for writing menus/dish of the day, industries, "