Indigo Blue Winsor & Newton Promarker alcohol pen, perfect for fine artists and illustrators. Use with colour pens for blending and effects. New design pens with a double end, each pen has a fine bullet point and a broad chiselnib, which allows you to easilyswitchbetween shading larger areas and precision detailing. Superb alcohol-based streak-free coverage so you can achieve flawless, print-like results.