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

Archival pigment ink is designed to be waterproof and fade-resistant, so your lines stay legible over time. It also dries quickly and remains vibrant on standard drawing and writing papers, making it great for long-term records.

The metal-clad tip helps resist wear when you draw along rulers, templates, or guides, so your lines stay consistent and true over repeated use.

0.3 mm produces finer lines suitable for ultra-detailed work, 0.4 mm offers a balance between detail and readability, and 0.5 mm yields a bolder line. For alternatives on Fepy, you can explore: 0.3 mm variant at https://fepy.com/product/uni-pin-fineliner-0-3-mm-black and 0.5 mm variant at https://fepy.com/product/uni-pin-fineliner-0-5-mm-black.

Yes. The metal-clad tip is designed to withstand guiding along rulers and templates, helping you keep straight, accurate lines over time.

Smooth, non-coated drawing papers, notebook pages, and vellum-style papers all pair well with this pigment ink. If you’re unsure, testing on a scrap sheet before a big drawing is a good idea.

The quick-setting pigment helps minimize smudging, and lines tend to scan cleanly, making it work well for digital capture and archival copies.

Keep the cap securely closed when not in use to preserve the tip and ink. Store the pen upright or horizontally in a cool, dry place away from direct sunlight to maintain tip performance.

This fineliner is designed as a disposable pen. When the ink runs low or the tip wears, you’ll typically replace the pen rather than refilling it.

The ink is designed for writing and drawing use, with archival and water-resistant properties. Keep away from eyes and mouth, and use as intended. If you have sensitive skin or reactions, handle with care and wash hands after use.

Great for journaling, sketching, diagramming, labeling, and any task that benefits from clean, consistent lines—like diagrammatic notes, reminders, or schematic layouts.

It delivers dependable line quality, archival-grade ink, and durability with a cap that protects the point—providing long-term reliability for both everyday notes and professional artwork. If you frequently work with grids or templates, its wear-resistant tip adds extra value over time.