0.1mm for hair-thin details, 0.7mm for bold definition, brush tips for organic strokes that respond to pressure. The ink flows consistently through every size, maintaining opacity without bleeding through paper.

Archival pigments resist fading and remain acid-free, critical for work you're keeping or selling. Once dry, the ink becomes completely waterproof and smudge-proof, overlay washes, handle pages, add color layers without disturbing your linework. This permanence matters for mixed media pieces where ink anchors the composition beneath subsequent materials.

The wallet format keeps pens organized and protected between sessions. Four-pen sets focus on either pure line variation or line-plus-brush versatility. Eight-pen sets add specialty nibs, soft brush for expressive marks, chisel for calligraphic strokes, bullet for consistent dots and stippling. Choose based on your drawing style: technical illustrators favor complete line weight ranges, while sketch artists often prefer sets that include brush options for varied mark-making.