From Amazon
uni-ball PWE-5M Liquid Chalk Pens. Multi-Purpose Wipeable Coloured Markers for Blackboards, Chalkboards, Whiteboards, Glass, Mirrors, Plastic, Windows, Metal. Safe for Kids. Bullet Tip. 8 Pack
This product is also available at 5 unverified merchants.
Too expensive?
Get a notification as soon as the price drops.