Lt Olive Art and Graphic Pen from Zig by Kuretake (Colour 56)
Art & Graphic Twin is a twin-tipped marker for amateur and professional alike. The colours are water-soluble and 2 or 3 colours are easily thinned or mixed using the blender pen, or water. It is great for use with rubber stamps as well as cartooning, sketching or graphic illustration.
They feature a wonderfully flexible brush tip and a 2mm fine tip, and 80 colours are available.