Uni Pin Fine Line Drawing Pens

Uni Pin Fine Line Drawing Pens

£2.00
£2.00
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Uni Pin Fine Line Drawing Pens
  • Uni Pin Fine Line Drawing Pens
Uni Pin Fine Line Drawing Pens

Uni Pin Fine Line Drawing Pens

Uni Pin fineliners are professional, pigment-based drawing pens manufactured by Mitsubishi Pencil in Japan. Utilizing proprietary Uni Super Ink, these calibrated technical pens deliver sharp, archival lines that are completely waterproof, smudge-proof, and fade-resistant once dry, making them the ideal layout tool for mixed-media artists and illustrators.
Ink Type

Archival carbon pigment (Uni Super Ink)
Available Widths

0.1mm, 0.3mm, 0.5mm
Nib Material

Steel-supported plastic polyacetal nib
Waterproof

100% Waterproof and Copic-marker safe once cured. Non-refillable.
Refill Type

Single Use/Disposable
Additinal Spec

Cap: Replace immediately after use — tips dry out within minutes if left uncapped
Origin

Japan — Mitsubishi Pencil Co. (Uni)
£2.00
£2.00
Taxes included. Shipping calculated at checkout.

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Shipping

Packaging: 

We know art supplies are fragile. All professional pair and boards are shipped in reinforced rigid flat mailers. No tubes, no folds, no crushed corners. 


Order Processing Times: 

Orders are processed within 1–2 business days - we always aim to dispatch all “in-Stock’ items within 24 hours..

Note: Orders placed after 2 PM GMT on Fridays will be processed the following Monday.

Domestic Shipping (UK):

Standard (2–4 days): £3.50 (Free for The Illustrator & Studio Master tiers).

Priority (1–2 days): £4.50 (Free for Studio Master tier)

International Shipping: 

We ship globally. Costs are calculated at checkout based on weight and destination. Please note that customers are responsible for any local customs duties or taxes.

Order Tracking: 

You will receive a tracking link via email the moment your tools leave our studio. 
Returns

30-Day Change of Mind: 

We offer a 30-day return window (exceeding the UK legal minimum of 14 days). Items must be unused, in original packaging, and in "as-new" condition.

Faulty Goods: 

In the rare event of a defect, you are entitled to a full refund or replacement within 30 days. We will cover all return shipping costs for faulty items.

Defective Nibs: 

Occasionally, a pen may arrive dry or a nib maybe scratchy. Contact us within 7 days of purchase with a photo/video of the issue and we will send a replacement immediately.

Exclusions:

Due to the nature of the product, unless faulty we cannot accept returns on opened markers or used paper pads returned.

Digital Goods: 

The "Birthday Palette" and other digital downloads are non-refundable once accessed.


How to Start a Return: 

Email studio@inkwellartsupplies.com with your order number. We aim to process all refunds to the original payment method within 5–10 business days of receiving the item
The Nib Safety Net

"Gravity Happens. We’ve Got You Covered."

We know the heartbreak of a fountain pen hitting the floor. As a member of our Creative Rewards, you don't have to worry about the 'tines.' If the worst happens, just send us a photo and we'll send you a 50% discount for a fresh start.

"The Nib Safety Net" – Terms & Conditions

  • Eligibility: This benefit is exclusive to active members of the Creative Rewards program at the time of the accident.
  • Coverage: The 50% discount applies strictly to accidental damage (e.g., dropping the pen) that renders the nib unusable. It does not cover intentional damage, loss of the pen, theft, or normal wear and tear.
  • The Claim: To activate your discount, you must provide a clear photo of the damaged nib and your original order number to oops@yourstore.com.
  • Limitations: This discount is valid for a one-time replacement per pen purchased and applies only to the cost of the replacement nib unit. It cannot be combined with other promotional codes or used for full pen replacements.
  • Availability: We will provide the discount for the exact nib model where stock is available. If the model is discontinued, we will offer a 50% discount on a comparable alternative nib unit.

Calibrated Precision for Technical Inking
The Uni Pin range is built around a robust, metal-shrouded polyacetal tip that maintains a fixed, unyielding line width across its lifespan. The magic sits entirely in the chemical formulation of the ink: the carbon pigment particles chemically bind to paper fibers, rendering the lines completely immune to water, alcohol markers, and erasing forces. This makes them the ultimate layout tool to establish your linework before overlaying liquid media or heavy graphite under-sketching.

Choosing the right width
Three widths serve different roles. The 0.1mm is for highly detailed cross-hatching, architectural linework, and any area where a 0.3mm would be too heavy. The 0.1mm tip is fragile and should not be pressed on rough paper surfaces. The 0.3mm is the most versatile — fine enough for most detailed work and robust enough for regular daily use. The 0.5mm is for outlines, thicker marks, and panels where a more confident, broader line is appropriate. Most illustrators use two widths — 0.3mm for detail and 0.5mm for outlines.

Honest Note:

While Uni Super Ink is completely waterproof, you must allow a 60-second curing window for the pigment particles to lock into the paper before running heavy watercolor or ink washes over your lines. The fine 0.1mm tip is a delicate structural element; if you press down heavily or drag it across textured cold-press watercolor paper, you will abrade the tip and split the internal ink feed. Use it on smooth Bristol board or layout paper.

Who is it For?

  • Illustrators who ink pencil drawings before adding light watercolour or wash
  • Manga artists who use fineliners for detail work alongside dip pens
  • Art students and educators who need a reliable, accessible inking tool
  • Anyone who needs a consistent fine line pen that holds up under light wet media

FREQUENTLY ASKED QUSTIONS (FAQ)

Which width should I start with?

0.3mm is the most versatile starting width — fine enough for most detail work, robust enough for regular use without the fragility of the 0.1mm. Add a 0.5mm for outlines and thicker marks if your illustration style uses distinct outline weights. The 0.1mm is for specialists who need maximum fineness.

How do fineliners compare to dip pens for illustration?

Fineliners produce a consistent, fixed line width — every stroke at a given pressure produces the same weight. Dip pens produce variable line width through flex — press for thick, release for thin. For line consistency and portability, fineliners are easier. For expressive line variation and full waterproof performance, dip pens with De Atramentis or Kakimori are better. Most professional illustrators use both for different purposes

Works perfectly with....