Pitt Artist Pen S Marker Warm Gray IV Faber-Castell 0.3mm Pigmented ink. Great resistance to the action of light. Long tip set in metal. Water resistant, permanent. Odourless, acid-free, neutral pH. Does not go through the paper. Line width S = 0.3 mm. Color 273 warm gray IV. Brand: Faber-Castell. Ink drawings have a great artistic tradition. They offer expression and durability to the drawings and can be combined with other techniques. This product combines the advantages of super lightfast pigmented ink for artists with the benefits of a modern, easy-to-use marker.