Uni-ball Uni Pin Fineliners, 0.03mm, Extreme Micro Lines, Pigment Ink, Comfortable Grip, Ideal for Technical Wrting & Drawing - Black

A 0.03 mm line produces ultrafine strokes that are ideal for minute details, tight crosshatching, and labeling in technical diagrams. It’s best for controlled, precise work rather than broad strokes.

The Uni Pin uses archival pigment ink that is waterproof and lightfast, helping your lines stay legible over time even when exposed to moisture or light.

The metal sleeve protects the delicate tip and helps keep lines consistent when you’re guiding the pen along a ruler or edge, reducing wobble and tip wear.

Quick Set refers to ink flow and drying behavior that minimizes smears when you make successive passes or layer fine details, helping you build complex lines without smudging.

It performs well on standard sketchbook or drawing paper, as well as technical drawing papers used for architectural or map plotting. For best results, use smooth, bleed-resistant papers designed for ink.

Keep the cap securely on when not in use to prevent the nib from drying out. Store upright or flat in a case to protect the tip from impact and dust. Avoid pressing hard on the nib to maintain line fidelity.

Yes. The pigment ink is designed for archival quality and is generally non-toxic for typical stationary use. It’s built for long-term legibility in drawings, journals, and technical work.

For broader and bolder lines, you might consider the 0.05 mm or 0.1 mm variants. Examples available on Fepy include: Uni Pin 0.05 mm (MI-PIN200-005-BK-1) at https://fepy.com/product/uni-ball-uni-pin-0-05-mm-mi-pin200-005-bk-1 and Uni Pin 0.10 mm (MI-PIN200-010-BK-1) at https://fepy.com/product/uni-ball-uni-pin-0-10-mm-mi-pin200-010-bk-1. These offer thicker lines with different applications, such as diagram labeling, sketching, or calligraphy nuances.

Use it for micro-labels on maps or technical drawings, fine hatch shading in architectural sketches, tiny annotations in journals, and any detail work where precision and clean lines are essential.

Absolutely. Pair it with light guidelines, build up micro-details slowly, use the cap to prevent drying between passes, and switch to a slightly bolder size (like 0.05 mm or 0.1 mm) for emphasis or broader shading in later steps.

Yes. It combines an ultra-fine 0.03 mm line with archival, waterproof pigment ink and a protective metal sleeve, delivering consistent precision and durability for technical drawings, mapping, and fine art across many sessions.