You can weave the most intricate designs with these fine liners. They create smooth free-flowing lines with permanent pigmented ink.The Japanese nibs are lightfast and archival, and the barrels are clear for easy ink visibility. This set contains 3 Graphite pens in nib sizes 0.1mm, 0.3mm, .05mm. Details:GraphiteIncludes assorted sizes (0.1mm, 0.3mm, 0.05mm)3 pensPigment inkPermanent, lightfast and archivalWater based and solvent free