The yellow 6mm Zig Wet Wipe Chalk Marker is a water-soluble pen that is ideal for writing on non-porous surfaces, its brilliant colour will stand out on acetate, windows, mirrors, signage for cafes and restaurants; if you have been on the hunt for pens to write on chalkboard then the Zig chalk marker is for you. The Zig multi surface and blackboard chalk markers can easily be wiped off with water or Windex, Artworx art and craft supplies stocks the full selection of Zig Wet Wipe marker colours; red, blue, brown, black and the popular yellow chalk pen.