Shachihata Poster Markers,Highly Opaque,Chisel Point 12.0mm,BK Poster markers are highly opaque. Each marks on paper, metal, plastic, rubber and more. Ideal for when you want a long-lasting but not necessarily permanent outdoor marker. Poster markers are used in everything from writing on glass shop windows to making signage. On nonporous surfaces, poster marker can be easily removed with household cleaning fluids, yet markings, made on absorbent materials such as cardboard, will remain strong and vibrant even after extended exposure to the elements.