Extra Fine Tip White Chalk Pens (4 Pack 1mm Nib) - White Dry Erase Chalk Ink Markers for Blackboard, Chalkboard, Windows, Signs, Glass - Water Based, Non-Toxic, Wet Wipe Erasable : Amazon.co.uk:
5 Hacks for Removing Chalk Markers From Any Surface
Pentel Assorted Chisel-Tip Wet-Erase Chalk Markers - Pack of 4 | Robert Dyas