PLEASE BE ADVISED - Our Liquid Chalk Markers work perfectly with bright and vivid colors on ALL non-porous surfaces and they are water-based and non-toxic. Some Chalkboards May Not Be Suitable For The Use Of Chalkboard Markers so it's recommended to try them first on small areas and always follow the cleaning instructions provided especially when using and markers. Chalkboard Markers Do Not Come Off Chalk Paint. MADE FOR EVERYONE- Whether you're a Teacher Mom Student Artist Kid or Bistro Owner these are the chalk markers you're looking for Manufacturered by HunYUN. KID SAFE AND ODOR FREE- Dustless non-toxic formula is both eco-friendly and safe for use at home JUICY VIVID COLORS: We dare you to find brighter smoother and more consistent colors in a chalkboard marker! Tried and tested by thousands of professionals calligraphers and artists we guarantee you'll be impressed. THE ULTIMATE FREEDOM OF EXPRESSION. HunYUN's liquid chalk markers are widely used as a chalk lettering tool and to decorate wedding signs milestone boards menus LED boards.