SAKURA
Sakura Pigma Micron (6-Pack)
Best for: Manga artists, graphic designers and journalers who need fine black lines

KOUSICOO
Twelve black fineliner pens, running from a 0.2 mm needle tip up to a bold 3.0 mm nib with one brush tip, filled with waterproof archival pigment ink.
Best for: Doodlers, zentangle fans and comic beginners who want many line widths
The Muchcute Micro Fineliners are a set of 12 black drawing pens that run from a 0.2 mm needle-fine tip up to a bold 3.0 mm nib, with a brush tip for the twelfth pen. That spread covers fine detail, outlines and solid fills in one pack.
The ink is an archival pigment ink that the listing describes as waterproof once fully dry, fade resistant, quick drying, acid free and no bleed. Muchcute lists the pens as compatible with pencil, watercolor paint, alcohol markers and highlighter.
Based on the manufacturer's Amazon listing.
The set has 0.2 mm (005), 0.25 mm (01), 0.3 mm (02), 0.35 mm (03), 0.40 mm (04), 0.45 mm (05), 0.50 mm (08), 0.55 mm (1.0), 1.0 mm, 2.0 mm, 3.0 mm and a brush tip. The listing pairs each line width with a cap size code.
The listing says the ink is waterproof, fade resistant, acid free, photo safe and quick drying. It resists water once it is totally dry, which takes a few seconds.
The tips are nylon and are made to glide without skipping on journal, watercolor, tracing and vellum paper. Keep a light hand on the finest points so they do not bend.
Muchcute lists the pens as compatible with pencil, watercolor paint, alcohol markers and highlighters, so you can ink first and color after.
The plastic packaging is also a storage case, which keeps the set together on a desk or in a bag.
The ink is listed as non-toxic and odorless and conforms to ASTM D-4236 and EN71-3.
Look elsewhere if: you want pH-neutral ink with an AP certification seal. The Sakura Pigma Micron (6-Pack) lists both, in six sizes from 0.20 mm to 0.50 mm.
Muchcute Micro Fineliners (12-Pack)
Choose it for: Plastic packaging that doubles as a case
TWOHANDS Fineliner Set (12-Pack)
Choose it for: A storage pouch and labeled caps
Choose it for: pH-neutral ink with an AP seal
SAKURA
Best for: Manga artists, graphic designers and journalers who need fine black lines
TWOHANDS
Best for: Technical drawers, illustrators and journalers who switch line widths often
Ohuhu
Best for: Adult colorists who want brush strokes and fine detail from one marker