Chartpak Fine Tip AD Markers have a precise nib especially designed for detail work. These markers feature brilliant and sparkling permanent colors that are solvent-based and waterproof. Use on surfaces such as laminates, ceramics, acrylics, paper, vellum and art board. The color blends effortlessly when wet yet will hold and layer well when dry. Details:Available in multiple colorsFine tipColor-coded barrel and capXylene-basedPermanentWaterproofNontoxicConforms to ASTM D-4236