Artline Drawing Pens issue a super-thin line that is perfect for technical applications such as drafting, illustrating and graphic design. The friction-proof nib offers a consistent writing width. - Artline Drawing Pen Set - Wallet Set A, Set of 4Shachihata Artline Drawing Pen, WALLET 4 SET - Includes 0.1 mm, 0.3 mm, 0.5 mm, and 0.7 mm writing widths.