With their silky-smooth flow, even coverage and pinpoint accuracy, you'll find the ArtLiner perfect for sketching outlining, lettering and detail coloring. They're also acid-free, lightfast, water-proof, quick drying and completely smudge-proof when used with alcohol markers. The Neutral 6 Piece Set contains 3 brown pens and 3 gray pens with tip styles brush, 005, and 03.