These Edding 4090 Jumbo liquid chalk markers for glass, blackboards and other non-porous surfaces contain a water-based ink that can be wiped off with a damp cloth. The opaque, liquid chalk is light-fast and dust-free; and the marker features a chisel tip for broad letter strokes. Ideal for use in the catering sector, drawing on shop windows and menu boards. Supplied in a pack of 5 white chalk markers.