White Liquid Chalk Markers by VersaChalk - for Chalkboard Signs, Blackboards, Glass, Windows PROFESSIONAL QUALITY INK: We use the finest ink from Germany that dries in seconds. It doesn't easily smudge once it is dried but can easily be erased with a clean and damp cloth! ULTRA VERSATILE: Experience the freedom to write on any non-porous surfaces such as chalkboards, plastic, metal, glass, vinyl, and slate! ERASE EASILY: Wipes away cleanly from non-porous surfaces with a damp cloth. CAUTION: Does not work with chalkboard paint. Not all surfaces are non-porous. Always test first! EXTRA DURABLE REVERSIBLE TIPS: While other brands of markers have tips that fray easily, VersaChalk's high-density reversible marker tips are built for professional use. Our REVERSIBLE TIP allows you to write in fine and bold lines - just flip the tip over to switch between bold and chisel tips! NON-TOXIC, ODOR & DUST FREE: Odorless, washable ink is great for indoor & outdoor use! It's also perfect for kids