Set of 6 Faber-Castell PITT Artist Brush Pens- "Shades of Grey"- one each of cold grey III, cold grey IV, cold grey VI, warm grey III, warm grey IV, and warm grey V. Brush pens are pigmented India ink that is archival, acid-free (pH neutral), lightfast, and odorless. Ink is smudge-proof and waterproof when dry. Can be blended and color can be overlain. Tapered brush nib allows for a multitude of line widths and blending options. PITT Artist Brush Pens offer vibrant, rich, versatile colors in a very portable format- a must in any visual journaling kit. These pens are one of our favorites!