Uni : Pin Waterproof Lightfast Drawing Pen : Black : 0.6mm The Uni Pin Fine Line Drawing Pens are an Ultra Fine Marker with Superior Water Resistance that is So Good, that once the Ink is Dry it Will Not Smear, even if Water is Accidentally Spilt on the Page The Ink in the Uni Pin Ultra Fine Line Marker is Extremely Light Resistant and will not Fade even with Continuous Exposure to Light Uni Pin Ultra Fine Markers are Ideal where High Precision is Required for Example in Technical Drawing, Stencilling & Sketching Black Ink 0.6mm Tip