Uni Pin Fine Line Drawing Pen, 0.4 mm, Archival Pigment, Water-Resistant, Low-Bleed, Textured Grip, Ideal for Diagrams & Notes, Blue – Pack of 12

Tip size: 0.4 mm. Ink: archival pigment, blue. Properties: waterproof and low-bleed, paper-friendly with minimal feathering, metal-clad tip for ruler/stencil use, textured grip for steady handling, pack size: 12 pens.

A 0.4 mm tip sits between finer (0.3 mm) and thicker (0.5 mm) options, offering a balance of detail and line weight suitable for diagrams and neat handwriting. Colors vary by ink formulation, with blue providing strong contrast for headings and revisions. If you need finer detail, consider 0.3 mm; for bolder lines, try 0.5 mm.

Use it for technical diagrams, wiring/labelling in schematics, precise note-taking, planners and calendars, and any project where clean, consistent lines and clear revision headings are beneficial.

Keep the tip perpendicular to the paper for even ink flow. Use light, steady strokes rather than heavy presses, and rotate the page if needed to maintain control. Cap the pen when not in use to prevent the nib from drying out, and test on scrap paper before starting a fresh diagram.

Yes. The Uni Pin ink is archival pigment and designed to be stable and fade-resistant. It is typically described as non-toxic and suitable for school and office environments, though it should not be used on food-contact surfaces or ingested.

Always cap the pen after use. Store horizontally or with the nib level to prevent ink pooling and to maintain consistent line quality. If the pen feels dry after a break, a few light strokes on scrap paper can help prime the nib before resuming your work.

Returns are typically handled by the retailer’s policy. If you’re not happy with the purchase, check the store’s return terms for unused items in original condition and follow the stated process to initiate a return.

Yes. If you want similar pens in different widths or colors, you can explore these options on Fepy.com: Uni Pin Fine Line 0.4 mm Black 12-pack — https://fepy.com/product/uni-pin-fine-line-0-4-mm-black-12-pack; Uni Pin Fine Line 0.3 mm Blue 12-pack — https://fepy.com/product/uni-pin-fine-line-0-3-mm-blue-12-pack; Uni Pin Fine Line 0.5 mm Blue 12-pack — https://fepy.com/product/uni-pin-fine-line-0-5-mm-blue-12-pack.

Twist or uncap the pen, prime the nib with a few light strokes on scrap paper until a clean line forms, then begin your diagram or notes with smooth, steady strokes. Keep the cap on when not drawing to maintain ink freshness.

Archival pigment ink is designed to resist fading and water exposure, ensuring diagrams, plans, and notes stay legible over time on a variety of papers. It also tends to be color-stable, helping headings and labels remain clear for years.