Whether you are doing traditional lettering, illustrations, or manga. Zebra Brush pens are the tool for you offering deep rich black color and varying lines widths depending on applied pressure. Brush Pen Tip Allows for Thick and Thin Lines in One Expressive Tool Permanent Pigment Ink is Acid Free and Archival Quality for Lasting Impressions Water Resistant Cap Snaps Tight to Maintain Pen Freshness and Life AP Non-Toxic Available in Ultra Fine, Fine, and Medium Point Sizes and Double Ended with Fine and Medium Point Available in Black Ink