Erasable Chalk Markers by American Crafts | set of 8 markers, multi-color MULTI-SURFACE USES: Erasable chalk markers work on chalkboards, dry erase boards, windows, glass, mirrors, metal, ceramic and more. Important: always be sure to test a small portion of your target surface first before wider use. CREATE UNIQUE, CHANGEABLE MESSAGES: When used with American Crafts black chalkboard paint (sold separately), you can write amazing changeable messages that bring any space to life.