Mr. Pen Liquid Chalk Markers Assorted Colors 6piece | eBay
Amazon.com : Chalkola Natural Chalkboard Cleaner Spray & Eraser Kit for Liquid Chalk Markers - Suitable for Whiteboard, Blackboard and Dry Erase Boards - Comes with White Chalk Pen : Health & Household
Amazon.com : 100% Natural Chalkboard Cleaner Spray and Eraser Kit by VersaChalk (250 mL) - Remove Liquid Chalk Marker Ink from Chalk Board Signs, Whiteboard, Dry Erase Marker Board, and Blackboard : Office Products