WARNING! - NEVER use any chalk markers on chalkboard paint or cheap porous chalkboards. Test in a corner first. WRITE ON ANY PRIMED CHALKBOARD, GLASS, GLOSS OR OTHER NON POROUS SURFACE. These chalkboard markers also make great window markers! Use these chalk markers for glass, tile, contact paper, stickers, whiteboards, plastic, and metal with ease. The bright liquid chalk is sure to please. BRING YOUR CREATIVITY TO LIFE! Perfect for hand lettering and freestyle designs, Bandle B. Liquid Chalk Markers come in 8 vibrant colors to help your designs, messages, and slogans pop off of chalkboards or whiteboards. These markers are easy to use and erase. PERFECT FOR ANY OCCASION. Looking for a way to write out directions or say something you want everyone to read? The Bandle B. Liquid Chalk Markers are the perfect way to do it. For use in your home or business, the vivid colors create eye-catching designs on your writing surface to make a lasting impact. REVERSIBLE TIP! Our Liquid Chalk Markers with reversible tip, makes it easy for anyone to create fine and bold lines. No more tedious filling in with a skinny marker or constant erasing with a bold marker, the Bandle B. Liquid Chalk Markers make it as easy as 1,2,3 to change tips. 5- STAR REPLACEMENT GUARANTEE! That's right; we stand behind our set of liquid chalk markers! No questions asked refund or replacement for one full year, including your shipping costs. We will always do what we can to make you happy with your purchase.