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These Chalk Markers are handy for mirrors, glass, plastic AND chalkboards of course. - YouTube
STATIONERY ISLAND Liquid Chalk Pens White Markers for Blackboards Dry Erase Chalk Marker Pens Wipeable for Chalkboard, Window, Glass, Signs and Mirrors - 3mm Fine Bullet Nibs (White Pack of 4) - Walmart.com
Fine Tip White Chalk Markers - 3mm – Savvy & Sorted
How to Draw and Write on Windows With Liquid Chalk Markers - FeltMagnet
Liquid Chalk Markers with Stickers - for Chalkboards, Windows, Glass, Labels, Whiteboards
8pcs Colorful 6mm Liquid Chalk Marker Pens 2Tips LED Writing Board Glass Art Pen | eBay