Uni-ball Signo Broad UM-153

Uni-ball Signo Broad UM-153

£2.50
£2.50
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Uni-ball Signo Broad UM-153
  • Uni-ball Signo Broad UM-153
Uni-ball Signo Broad UM-153

Uni-ball Signo Broad UM-153

Ink Type

Pigment-based gel ink
Opacity

Maximum (Widely considered the most opaque white gel pen available)
Waterproof

Yes (Super Ink formula resists water and fraud)
Alcohol Marker Proof

Yes (Stays crisp under alcohol washes)
Delivery System

Capped rollerball pen
Recommended Tool

Built-in 1.0mm heavy-metal broad ball tip
Additinal Spec

High-volume structural ink discharge that outputs a thick, heavily pigmented 0.65mm white line, universally loved by mixed-media artists for popping eye highlights over intense black inks.
Origin
£2.50
£2.50
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.

Maximum Opacity for Bold Lines

The Uni-ball Signo Broad UM-153 is a heavy-duty gel pen famous for its thick, 1.0mm tip that lays down a vivid, paint-like white line over even the darkest backgrounds.

Acid-Free and Water-Resistant

The pen is engineered with Uni Super Ink technology, making it waterproof, fade-resistant, and tamper-proof—ideal for archival artistic projects and legal documents.

Honest Note:

Who is it For?

FREQUENTLY ASKED QUSTIONS (FAQ)

Does this pen smear?

Because the ink flow is heavy, it requires a slightly longer drying time (roughly 30-60 seconds) than fine-tip pens.

Is it refillable?

Widely available as a disposable pen

Works perfectly with....