The Montana Sketchliners make drawing, line work, illustration or even just writing notes aesthetic, fun and creative. These fine liner pens contain true black, waterproof, alcohol-based pigment ink that is compatible will all Montana Acrylic markers and colors. The pen nibs are made of strong synthetic and will not break up or fringe. Details:Black ink5 pensWaterproofAlcohol-based pigmentAcid freeContents:0.1mm pen0.2mm pen0.3mm pen0.5mm pen0.8mm pen