Protect your artistic chalk creations by using this fantastic assortment of markers. In six colors, waterproof chalk markers (when dry) are waterproof, smudge proof and fade proof on all non porous surfaces. Use them on glass, mirrors, plastics, metal and of course, our chalkboards. The ink will not come off until you want it to come off The secret to great signs is not so much the artists talent but the tools employed. These original chalk markers (when dry) are resistant to smudging, fading and light rain. Use on all non porous surfaces. They clean with our chalkboard sponge.