Made with high quality pigments, Faber-Castell PITT Pens have acid-free archival India ink. They are odorless, permanent, lightfast and smudge proof/ waterproof when dry. Unlike traditional markers they will not bleed through paper. Use on canvas, fabric, wood and ceramics.The brush nib can be refreshed by simply taking it out and turning it around!Colors include: Cold grey III, Cold grey IV, Cold grey VI, Warm grey III, Warm grey IV, Warm grey V