These wet-erase chalk markers have a chisel tip for broader strokes and have semi-permanent ink, which will wipe completely clean with a damp cloth but will not wash off in a light shower. Perfect for blackboards, whiteboards, glass, ceramics, metals and non-porous surfaces, these versatile pens can be used for advertising, menu boards in pubs and for the home or school. Specifications Vivid liquid ink chalk marker Standard chisel tip Won't wash off in a light shower. Pentel Chalk Markers have a liquid chalk formula which imitates real chalk, but has a far superior performance and is ideal for use on blackboards. For use on conventional slate chalk board and glass these Pentel Markers contain liquid chalk which removes easily with a wet cloth.