Uni Pin Fine Line Drawing Pen, 0.3 mm, Archival Pigment, Water-Resistant, Low-Bleed, Ideal for Diagrams & Notes - Black

Micro detail: 0.3 mm line width. Archival, waterproof pigment ink. Low bleed to minimize feathering. Metal-clad tip for template use. Ergonomic grip on the barrel for controlled strokes.

It's well-suited for paper commonly used in planners, sketchbooks, diagrams, and technical pads. For best results, pair it with smooth, bleed-resistant paper.

Use smooth paper, apply light, steady pressure, and leverage a ruler with the metal-clad tip for straight lines. Keep the cap on when not in use to prevent drying.

Yes. The pigment ink is waterproof and designed to resist fading, helping your diagrams and notes stay legible over time.

Absolutely. The 0.3 mm pen features a template-safe metal-clad tip that works well with rulers for precise diagrams and measurements.

0.3 mm offers a balance between precision and coverage: crisper lines than 0.5 mm, while still being more noticeable than 0.1 mm for detailed work. If you need ultra-fine lines or bolder outlines, you might choose a smaller or larger nib.

Ideal for technical diagrams, schematic labels, callouts in notebooks, fine-line illustration, annotations in planners, and any task requiring precise, water-resistant lines.

Cap the pen securely after use and store it in a cool, dry place away from direct sunlight. It’s best kept in a pen holder or horizontal position when not in use to prevent drying.

Yes. The 0.3 mm Uni Pin provides durable archival pigment with water resistance and low bleed, which can offer better long-term legibility and precision for diagrams and notes compared with many standard ink pens.

Yes. The product can be returned under Fepy’s standard return terms, typically requiring the item to be unused and in its original packaging.

If you’re comparing sizes, you might look at these alternatives on Fepy: 0.5 mm: https://fepy.com/product/uni-pin-fine-line-drawing-pen-0-5mm-black and 0.1 mm: https://fepy.com/product/uni-pin-fine-line-drawing-pen-0-1mm-black. There’s also 0.2 mm: https://fepy.com/product/uni-pin-fine-line-drawing-pen-0-2mm-black.