Faber Castell Pitt Artists' Pens are an assorted selection of high-quality pens combining the technical advantages of artists' ink with the benefits of an easy-to-use disposable pen. Ideal for graphic artists, designers, illustrators, and architects, these pens are suitable for making expressive strokes or accurate detail. Specifications include high light resistance, permanent color, water resistance, odor-free, and pH neutral. The pens feature a brush tip. These artist-quality PITT drawing pens from Faber-Castell are available in various sizes and shapes, including fine liners, bullet tip, brush tip, and chisel tips. They come in standard Black Indian Ink, as well as Sepia and Sanguine variants. They are great for urban sketchers and inkers. The acid-free, archival ink is smudge-proof, waterproof, and won't bleed through paper. For best results, we recommend using Pitt pens on a smooth surface such as fine grain cartridge paper or Bristol board. Product Details: Pigmented India ink, High lightfastness, Waterproof, permanent, Odorless, acid-free, pH neutral, Does not bleed through paper.