Uni Pin Fine Line Drawing Pen, 0.4 mm, Archival Pigment, Water-Resistant, Low-Bleed, Ideal for Diagrams & Notes - Blue

The pen uses pigment-based archival ink that is water-resistant, helping your diagrams and notes resist smudging and fading over time. This makes it a solid choice for important documents and drawings that you want to preserve.

A 0.4 mm tip produces precise, compact lines that are easy to read in diagrams and technical notes, while reducing feathering on many paper types.

This pen works well on standard drawing and writing papers. It’s designed to minimize feathering, but very rough or highly textured papers may still show some bleed, so test on a sample if exact performance matters.

Cap the pen firmly after use to prevent drying. When in use, hold the pen steady for consistent lines; the textured barrel helps with grip. Store it capped and away from extreme heat or cold to preserve the ink consistency.

Yes. The pen features a metal-clad tip that works well with rulers and templates, making it suitable for clean, straight lines in diagrams and technical drawings.

For finer lines you might prefer a 0.3 mm pen; for bolder lines, a 0.5 mm pen can be more noticeable. If you’re choosing among Uni Pin options on Fepy, you can explore these alternatives to suit your line weight needs: - 0.3 mm option: https://fepy.com/search?q=uni+pin+fine+line+pen+0.3+mm - 0.4 mm black option: https://fepy.com/search?q=uni+pin+fine+line+pen+0.4+mm+black - 0.5 mm option: https://fepy.com/search?q=uni+pin+fine+line+pen+0.5+mm

The Uni Pin Fine Line Pen is typically designed as a disposable drawing pen; when the ink is used up, you would replace it with a new pen rather than refilling the cartridge.

If you’re not satisfied with your purchase, you can refer to Fepy’s standard return policy for eligible items and timeframes. Check the product page for any specific return conditions that apply to this item.

Because the ink is waterproof and archival, it’s not easily erasable with a standard eraser. If you need to fix a line, you can redraw over it or use correction tape/white-out to cover the mistake before continuing.

The pen uses archival pigment ink designed for durability and long-term legibility. For formal archival standards, verify compatibility with your specific archival requirements and handle the ink according to general safety guidelines for art supplies.