Thornton's Art Supply Liquid Chalk Markers with Reversible Tips, Assorted Colors, Pack of 18 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 very smoothly, dry quickly and they wipe off in cinch. Simple to use for writing messages to your friends and family, advertise specials, market new products or events at restaurants, retail and coffee shops. Includes: Black, White, Red, Fluorescent Orange, Yellow, Neon Green, Purple, Hot Pink, Brown, Light Brown, Peach, Dark Red, Olive, Forest Green, Light Blue, Sky Blue, Light Purple, Pale Yellow, 6 tip replacements and 8 chalk labels.