Mungyo Board And Glass Chalk Pen Set Of 5 - Orange, Blue, Purple, Red, Silver "Mungyo Glass and Board Chalk pens set of 5 assorted colours Features â€ Length 9.5 mm X 60 mm, 5 assorted colours â€ Marks on any surface and any kind of board- - white or black dry erase board â€ Easily Erased with wet Tissue or cloth Application â€ Writes smoothly on glasses, windows, mirrors ,plastic - PP. PE.PS. Pet,etc â€ Multi purpose use-home, school, college, events, office, bars/restaurants for writing menus/dish of the day, industries, "