Sakura Pigma Micron Pens: The Complete UK Guide

Written by Paul Worrall

Micron pens are one of those products people buy once and then keep buying for the rest of their working life, and I mean that as a genuine compliment. Illustrators, architects, manga artists and journallers all seem to land on the same pen, which is unusual in an industry where everyone swears by something different.

I’m Paul Worrall. I spent nearly a decade running digital marketing for ARTdiscount, one of the UK’s larger online art retailers, and I now run Discount Art Supplies — a price comparison platform used by over 28,000 UK artists every week. Here’s what the nib sizes actually mean, why the ink is described as archival, and which set is worth buying.

What makes Micron pens different from an ordinary fineliner?

The difference is the ink, not the nib. Pigma ink is pigment-based rather than dye-based, which means the colour is made of tiny solid particles suspended in the ink rather than a dye dissolved into it. Once dry, that ink is waterproof, chemically stable and genuinely fade-resistant, which is why it’s classed as archival quality. It won’t smear, feather or bleed through most papers, and it stays put even if the page gets wet later — which is exactly why it’s trusted for legal documents, scientific record-keeping and museum archiving, as well as art.

Each pen also has a protective metal sleeve around the extended tip, which gives real resilience when you’re working against a ruler or drawing aid — something a standard felt-tip fineliner can’t offer, since the tip simply isn’t built for that kind of pressure.

What the nib sizes actually mean

The numbers on a Micron pen refer to the line width the nib produces, in millimetres, not the size of the pen itself. It’s worth knowing the actual conversion, because “005” and “05” look deceptively similar on a shelf but produce very different lines:

• 005 — 0.20mm, the finest line, ideal for minute detail and delicate crosshatching
• 01 — 0.25mm
• 02 — 0.30mm
• 03 — 0.35mm
• 05 — 0.45mm, a genuinely useful all-round line for everyday sketching and journalling
• 08 — 0.50mm and up, suited to bold outlines and confident lettering

Beyond the numbered range, Sakura also makes Brush and Graphic tips for variable-width strokes, and a Grays range (in varying tones) for shading and adding depth to linework without switching to a different medium entirely.

🛒 Buy the 6-Pen Set on Amazon   🔍 Compare Prices

Who actually uses Micron pens, and for what

The range of people who rely on these pens is genuinely wide, and it says a lot about how versatile the ink is. Illustrators and manga artists use them for clean inking over pencils. Architects, archivists and scientific illustrators use them for technical drawing and record-keeping where permanence matters legally as much as artistically. Bullet journallers and planner enthusiasts use them because the ink won’t bleed through typical journal paper. And urban sketchers reach for them specifically because the waterproof ink lets you ink a drawing and then paint over it with watercolour without the linework smudging — one of the most common reasons artists switch to Micron pens in the first place.

Which set should you actually buy?

For most people starting out, the standard 6-pen set covering 005 through 08 is the sensible choice — it gives you the full practical range without paying for specialist tips you may not use yet. If you already know you’re mostly doing fine detail work, a couple of the 005 and 01 pens alone will get heavy use. If lettering or bold outlines are more your thing, the 08 is worth having on its own. The Grays set is a genuinely useful addition once you’re comfortable with linework and want to start adding tonal depth without switching to a completely different medium, and Sepia is a popular alternative to black for anyone wanting a softer, vintage-toned line for illustration work.

The honest trade-off with Micron pens generally: they’re disposable, not refillable, and the tips can wear down with heavy use against rulers or rough paper, so a well-used pen doesn’t last forever. For the reliability and archival quality on offer, most artists consider that a fair trade.

🛒 Buy Pigma Micron 005 on Amazon   🔍 Compare Prices

FAQ

What are Sakura Pigma Micron pens used for?
Micron pens are widely used for technical drawing, illustration, manga and comic inking, bullet journaling, hand lettering, and archival documentation. Their pigment-based ink is chemically stable and fade-resistant, which is why architects, archivists and scientific illustrators rely on them alongside artists.

What do the Micron pen sizes mean?
The numbers refer to the nib’s line width in millimetres, not the pen’s overall size. Common sizes run from 005 (about 0.20mm, extremely fine) through 01, 02, 03 and 05, up to 08 and 10 (around 0.50mm and above, much bolder). A lower number always means a finer line.

Are Micron pens waterproof and archival?
Yes. Pigma ink is pigment-based rather than dye-based, which makes it waterproof, fade-resistant and chemically stable once dry. It won’t smear, feather or bleed through most papers, and it’s acid-free, which is why it’s classed as archival quality and safe for work you want to last.

Are Micron pens good for watercolour?
Yes, this is one of their most common uses. Because the ink is fully waterproof once dry, you can ink a drawing with Micron pens and paint over it with watercolour without the linework smudging or lifting, which is why they’re popular with sketchbook and urban sketching artists.

If you’re planning to ink over pencil and then paint on top, it’s worth checking our guide to the best pens for drawing and illustration for how Micron pens compare to brush pens and acrylic paint pens for different jobs. As always, check Discount Art Supplies before you buy — we compare prices across major UK retailers in real time, so you’re getting the best deal going.