Uni-ball Uni Pin Fineliner, 0.4 mm, Pigment Ink, Archival, Smooth Writing, Ideal for Technical Drawing & Writing, Black – Box of 12

A 0.4 mm tip produces a fine, crisp line that balances detail with readability, making it suitable for fine work without being overly delicate.

The pen uses pigment-based ink that is waterproof when dry and designed to be lightfast, providing long-lasting, smear-resistant lines suitable for archival use.

The metal-clad tip resists wear when you draw along guides, rulers, or templates, helping maintain accuracy over time.

Always cap securely after use and store the pen in a case with the cap on to minimize air exposure and protect the tip between sessions.

Yes. The combination of a fine 0.4 mm point and a durable tip makes it well-suited for use with rulers and stencils to achieve clean, precise lines.

The pigment ink provides a smooth flow with quick-drying properties to reduce smudging during overwriting or layering.

It writes well on standard paper, notebooks, and other typical writing surfaces; results may vary on glossy or non-porous media.

Yes. Its archival-grade pigment ink creates crisp lines that scan well and resist fading over time.

Both offer waterproof, lightfast pigment ink. The Uni-ball Uni Pin 0.4 mm features a metal-clad tip that enhances durability along guides, while Staedtler’s pigment liner varies in tip design; see the linked product for exact differences.

Micron PN and Uni Pin 0.4 mm both use archival pigment inks with fine lines; the feel and line consistency can differ by nib design and ink formula. Check the Micron PN listing for a direct side-by-side.

Choose 0.4 mm for detailed, legible lines with a balance of precision and coverage. If you need bolder lines, consider 0.5 mm; for ultra-fine work, look at 0.3 mm or smaller, depending on the project and paper quality.