are these pens fine or medium tip?

I would say they are fine. The uni-ball air (without the micro part) are thicker if you need a thicker tip otherwise I would say these are similar to biro tips in terms of size.

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uni-ball UB-188-M Micro Air Rollerball Pens. Premium 0.5mm Nib for Super Smooth Handwriting. Writes Like a Fountain Pen. Fade and Water Resistant Liquid Uni Super Ink. Box of 12 Black Ballpoint Pens

Product ID: 54427791

Details

Age range (description)
All Ages
Brand
uni-ball
Colour
black
Ink colour
Black
Material
Metal Plastic
Model name
UBA-188-M

💧fade & water resistant ink

✍️pressure-responsive smooth flow

🖊️0.5mm micro precision nib

AR$110689

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Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖋️ Write sharp, write smart — the pen that keeps up with your hustle.

TRUSTED GLOBAL ICON - Over 30 years of consistent smoothness and rich black ink, favored by professionals worldwide.
MICRO PRECISION MASTERY - Experience ultra-fine 0.5mm nib for crisp, detailed writing that elevates your notes and diagrams.
ADAPTIVE WRITING COMFORT - Ergonomic barrel with pressure-responsive ink flow adapts seamlessly to your unique writing style.
UNMATCHED INK DURABILITY - Uni Super Ink resists fading, water, and tampering—perfect for professional documents that last.
ALWAYS READY ALWAYS RELIABLE - Pack of 12 ensures you never run out, keeping you prepared for every meeting, exam, or creative burst.

The uni-ball UB-188-M Micro Air Rollerball Pen features a premium 0.5mm nib delivering fountain pen-like smoothness with fade- and water-resistant Uni Super Ink. Its pressure-responsive design and ergonomic grip provide a fluid, comfortable writing experience. Sold in a convenient box of 12, these pens are a trusted choice for professionals seeking precision, durability, and style in everyday writing.

Specifications

ASIN	B016BHQ0UO
Age Range Description	All Ages
Best Sellers Rank	6,736 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 160 in Gel Ink Rollerball Pens
Body Shape	Cylindrical
Brand Name	uni-ball
Closure Type	Click-Off Cap
Colour	black
Customer Reviews	4.6 4.6 out of 5 stars (1,322)
Drill Point	Fine
Global Trade Identification Number	04548351063887
Grip Type	Ergonomic handle
Hardness	F
Included Components	Pens Only
Ink Base	Water
Ink Colour	Black
Is the Product Left or Right Handed?	Ambidextrous
Item Dimensions	28 x 81 x 146 millimetres
Item Type Name	Fountain Pen Tip Air Rollerball Pens
Item Weight	0.1 Kilograms
Line Size	0.3mm
Manufacturer	Mitsubishi Pencil Company
Material Type	Metal Plastic
Model Name	UBA-188-M
Model Number	190470000
Recommended Uses For Product	Writing
Special Features	Waterproof
Style	12 Black
Unit Count	12.0 count
Water Resistance Level	Waterproof
Writing Instrument Form	Roller Ball Pen
Writing Technique	rollerball

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