These easy-to-use, water-based markers are an innovative alternative to traditional chalk. They have hi-opaque, pigmented inks that are lightfast, odorless and xylene free. Use them on any non-porous surface like chalkboards, windows, mirrors, dry erase boards, light boards, windshields and ceramics or as permanent color on wood and other porous surfaces. They draw and write smoothly, dry quickly, and wipe off in a cinch. Simple to use for writing messages to your friends and family, advertising specials and even marketing new products or events at restaurants and retail shops.Details:Includes white, black and red9 packs (4 markers per pack, 36 total markers)Wet-erasableNo dustNo smearingConforms to ASTM D-4236