With the chalk markers from uni you can not only write on boards, they are also suitable for use on windows, metals or plastics. The surface must be non-porous. Test the porosity of the surface with a small dot before use. The water-based ink is weather-resistant and does not smear even in the rain. The chalk markers are easy to wipe clean with a damp cloth. The chalk markers are ideal for use in the catering industry, for example for designing signs and dining boards, as well as for the retail trade for designing shop windows. The pen has a bullet tip with a line width of 1.8 - 2.5 mm. It has the ink colour fluorescent pink.