Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Technical Pens
Origin	-
Brand	Uni Mitsubishi
Tip Type	Extra Fine Slanted Flat
Ink Property	Waterproof and Fade-Resistant
Tip Material	Soft Flexible Brush Fiber
Line Width	0.4mm - 1.2mm (Variable)
Origin	Made in Japan
Ideal For	Detail Art, Outlining, and Sketching
Drying Time	Quick-Dry Formula
Pack Size	Set of 6 Assorted Colors
Barrel Design	Ergonomic Grip for Precision

6 reviews

Anonymous

Mar 28, 2026

Rating: 5/5

Perfect for intricate line work

The slanted tip offers incredible control for varying line widths without changing pressure too much. The ink flows smoothly and is truly waterproof once dry.

Anonymous

Mar 25, 2026

Rating: 5/5

Best fineliners I've owned

As an architect, I need precision. These pens deliver clean, sharp lines every time. The soft tip feels durable and hasn't frayed after weeks of daily use.

Anonymous

Mar 24, 2026

Rating: 5/5

Waterproof claim is accurate

I tested these with watercolor overlays, and the ink did not bleed or smear at all. Excellent quality consistent with other Japanese stationery brands.

Anonymous

Mar 17, 2026

Rating: 4/5

Great for calligraphy beginners

I bought these for hand-lettering practice. The slanted flat tip makes it easy to create thick and thin strokes naturally. Only wish the set came with more color options.

Anonymous

Mar 15, 2026

Rating: 5/5

Smooth and reliable

No skipping or blotching. The ergonomic barrel makes long drawing sessions comfortable. Highly recommend for technical illustrators.

Anonymous

Mar 04, 2026

Rating: 4/5

Solid choice for sketching

The flexibility of the tip allows for dynamic sketches. They dry very quickly, which is great for left-handed artists like me who tend to smudge.

5 FAQ

Q: Do these pens contain acid-free ink?

A: Yes, the ink used in Uni Mitsubishi Fineliner pens is acid-free and archival quality, making them safe for long-term artwork preservation.

Q: Is the cap airtight to prevent drying out?

A: The pens feature a secure snap-on cap designed to minimize air exposure, helping to keep the soft tip moist and ready for use even after periods of inactivity.

Q: What is the exact range of line widths this slanted tip can produce?

A: Depending on the angle and pressure applied, the slanted flat tip can produce lines ranging approximately from 0.4mm (fine edge) to 1.2mm (broad side).

Q: Are these pens suitable for use on watercolor paper?

A: Yes, these pens work excellently on watercolor paper. The waterproof ink ensures your outlines remain crisp even when wet media is applied over them.

Q: Can the tip be refilled or is it disposable?

A: These are designed as disposable fineliners. Once the ink is depleted, the entire pen should be replaced to ensure optimal performance and line quality.

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