Uni Pin Fine Line Drawing Pen, 0.3 mm, Archival Pigment, Water-Resistant, Low-Bleed, Textured Grip, Ideal for Diagrams & Lettering, Black – Pack of 12

Micro detail: 0.3 mm line width. Ink: archival pigment with waterproof, long-lasting properties. Feathering: designed to resist feathering on planners and grids. Grip: textured barrel for better control. Tip: metal-clad for template safety and durability. Color/pack: Black, pack of 12.

Smooth, clean surfaces such as planners, grid notebooks, and technical drawing paper are ideal. The ink is designed to be waterproof and resist feathering on these paper types, but it’s best to test on a small area if you’re using highly absorbent or coated papers.

Ideal for diagrams, technical labels, precise notes, and crisp lettering. It’s also great for wiring up connectors in diagrams, drawing fine details in architectural sketches, and creating clean, legible handwriting on planners.

Cap it when not in use to prevent drying. Hold the pen with steady pressure and a relaxed grip; let the 0.3 mm line ink flow smoothly. Use light, controlled strokes and, if needed, guide with a ruler or stencil due to the metal-clad tip for precise lines.

For alternatives, you can compare to other fine-line options such as the Uni Pin Fine Line Pen 0.2 mm (for slightly thinner lines) and the Sakura Pigma Micron 0.3 mm (a popular archival option). See these on Fepy: https://www.fepy.com/product/uni-pin-fine-line-pen-0-2mm-black-pack-12 and https://www.fepy.com/product/sakura-pigma-micron-0-3mm-black

Yes. The Uni Pin pen uses archival pigment ink that is waterproof, helping your diagrams and lettering stay legible over time without smearing when exposed to moisture.

The ink is designed for permanence and resistance to bleed on typical paper-types used in diagrams and planning. It’s intended for adult use and non-toxic in typical writing-instrument safety terms; as with any writing instrument, keep away from small children and avoid ingestion.

The Uni Pin 0.3 mm features a metal-clad tip designed for durability and template use. The nib itself isn’t typically user-replaceable; with proper care, the tip remains durable for precision work.

Buying a 12-pack ensures you have a steady supply of consistent 0.3 mm lines in black, which is convenient for ongoing projects, reduces frequent reorders, and typically offers a better per-pen price for bulk drawing tasks.

The 0.3 mm size provides finer lines suitable for detailed diagrams and precise lettering. If you need bolder lines, you might prefer larger nibs (e.g., 0.5 mm) or smaller ones (e.g., 0.2 mm). See related options on Fepy: https://www.fepy.com/product/uni-pin-fine-line-pen-0-2mm-black-pack-12 and https://www.fepy.com/search?q=0.5mm+fine+line+pen

Keep the cap on when not in use, store in a cool, dry place, and avoid pressing too hard while drawing to prevent excess ink from nibbing and clogging. Test on scrap paper if you’re switching between paper types to ensure consistent flow.