The Pigeon Letters pens feature a slightly curved tip, ideal for drawing, which separates them from other fine liners in the market (which feature flat tips). Read on, my friend! Precision fine line pens offer the versatility needed in detailed illustrations. Reliable pens are crucial to the creation process. Archival quality ink is fade-resistant, chemically stable and waterproof (this means watercolor friendly), making them ideal for professional artistry. No smearing or bleeding through paper. Five tip sizes offer variety for the finest detail to bolder lines: 01, 03, 05, 07, 09. * Black ink * Sizes 01, 03, 05, 07, 09 * Permanent * Fade-resistant * Bleed-proof