Is the ink waterproof?

I purchased 12 pens, .05mm, all black liquid ink.... Nowhere does it say it's waterproof. I purchased them based on someone here saying they were waterproof and I know it was a crap shoot. The pens draw beautifully, the ink flows nicely from the pen, even on heavy cold press wc paper, but no- it is NOT waterproof.

Are they really quick dry or does the ink smudge?

Best fine point I’ve found. Quick dry and wonderful pens. Highly recommend

Is the product quality guaranteed?

If you purchase through Prime and you’re not happy with the product, they offer free returns. I have used these pens for a year and they are my favorite very fine point pens.

There are 7 black pens in set A. Are all of them 0.5 mm or do they come in different measurements?

I'm not totally sure about that. I know that the entire set was 0.5 but I'm sure you could order a set of different sizes. Hope that helps.

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12 Pcs Rollerball Pens Fine Nib 0.5mm Japanese Smooth Writing Pen Quick Dry Liquid Ink Ballpoint Pen Stationery for Office Meeting Notes - Black Ink

12 Pcs Rollerball Pens Fine Nib 0.5mm Japanese Smooth Writing Pen Quick Dry Liquid Ink Ballpoint Pen Stationery for Office Meeting Notes - Black Ink

Product ID: 87275430

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Details

Brand
Frienda
Writing instrument form
Roller Ball
Colour
Black Ink
Ink colour
Black
Age range (description)
Adult
Material
Plastic

⚡Quick-dry liquid ink for smudge-free notes

🔍Transparent barrel shows ink level clearly

🖋️0.5mm ultra-fine nib for precision

Description

🖊️ Elevate your writing game with precision and style—don’t let your notes fall behind!

VERSATILE STYLISH - Sleek black ink and modern design make these pens perfect for office, home, or business use—because your ideas deserve the best.
WRITE FAST STAY NEAT - Quick-drying liquid ink ensures your work stays smudge-free, even during fast-paced meetings.
SMOOTH FLOW EVERY TIME - Built-in ink regulator guarantees consistent, smooth writing without skips or blobs.
INK VISIBILITY NO SURPRISES - Transparent pen barrel lets you monitor ink levels so you’re never caught off guard mid-sentence.
PRECISION AT YOUR FINGERTIPS - Ultra-fine 0.5mm nib delivers crisp, clean lines for flawless note-taking and professional documents.

This 12-pack of Frienda rollerball pens features ultra-fine 0.5mm nibs with quick-drying black liquid ink, designed for smooth, precise writing. The transparent barrel allows easy ink level monitoring, while the built-in ink regulator ensures consistent flow without leakage. Ideal for professional settings, these pens combine functionality with sleek design to keep your notes sharp and smudge-free.

Specifications

Manufacturer	Frienda
Brand	Frienda
Product Dimensions	15 x 14 x 1.5 cm; 109 g
Colour	Black Ink
Closure	Click-Off Cap
Grip Type	Smooth
Material Type	Plastic
Number of Items	1
Size	12 count (Pack of 1)
Point Type	Extra Fine
Line Size	0_5mm
Ink Colour	Black
Manufacturer Part Number	Frienda-Rolling Ball Pens-01
Item Weight	109 g