This Uni Chalk Marker is ideal for outdoor use on non-porous surfaces like chalk boards and windows. Producing a vivid, opaque color finish, it is perfect for creating signs and menu boards in shops, cafes and restaurants.Details:Available in multiple colors1.8mm-2.5mm medium nibWater-based chalk markerWater resistantOdor free and does not contain solvents or alcoholSpecially formulated for easy cleaning with a damp cloth