Posterman Wet-Wipe is easy to wipe off with a damp cloth and has a 6.0 mm centre cutting tip. Best suited for indoor use on chalkboards, glass surfaces and blackboards. The result is similar to chalk, but without the smudge the text becomes waterproof when dry. Perfect for shops, restaurants, pubs etc. You can write on windows, mirrors, ceramics, paper, glass, plastic, metal, wood, stone and more. Non-erasable on porous surfaces. Zig Posterman has a very opaque ink. Indoor use Chalk without mess Opaque colour Removable from non-porous surfaces with a wet cloth Erasable on chalkboard Xylene-free and odourless Available in a range of colours