These easy-to-use, water-based markers are an innovative alternative to traditional chalk. They have hi-opaque, pigmented inks that are light fast, 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 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, yellow, red and blue4 markersWet-erasableNo dustNo smearingConforms to ASTM D-4236