The Pentel Chalk Marker Wet Erase set of assorted colours is a semi permanent marker with a chisel tip.The Pentel Chalk Marker Wet Erase wipes completely clean with a damp cloth while its chalk based ink adheres to dry surfaces, retaining its opacity. The semi permanent formula will not wash of f in a light shower.The Pentel Chalk Marker Wet Erase pen is ideal for use on blackboards, whiteboards, glass, ceramics, metals and non porous surfaces making it perfect for use on menu boards in pubs or restaurants, glass writing, advertising and for student or school use.