Which refill do I order from Amazon for this pen?

It’s labeled “OHTO R-4C5NP 8E”

so, can i buy refills?

Yes part number: Ohto R-4C5NP it’s cheaper on another site too FYI for $2 instead of $10 on amazon. Jetpens

whats the plastic holder for? I want this for my small journal that has a loop for a pen, would this work?

OK, what they're calling a "holder" is actually a piece of plastic about the size of a credit card with a sleeve along one side in which the pen fits. I guess you put the card part between pages of a book to hold the pen there? I don't know, it doesn't seem very useful to me. As for the loop on your journal: How small are we talkin'? Because this pen is tiny. TI-NY. It is the approximate length (maybe 3") and diameter of a wooden cocktail pick. I'm not kidding. It's very small and difficult to write with - and I have small hands! As such, I can't imagine it holds enough ink to write very much. When I bought it, I was looking for something with a super-fine point that was not a gel pen, but this is actually just a super-tiny pen in all respects but was not enough of an expenditure to return it.

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Auto NBP-505MN-BK Ballpoint Pen, Oil-based, Black

Auto NBP-505MN-BK Ballpoint Pen, Oil-based, Black

Product ID: 25317725

Details

Age Range (Description)
Adult
Brand
OHTO
Color
Black
Ink Color
Black
Writing Instrument Form
Ballpoint Pen

📏Compact 91mm length fits business card holders

⚙️Durable aluminum & brass construction

🖊️0.5mm ultra-fine needle tip

Description

🖋️ The pen that fits your hustle — sleek, sharp, and always on point.

BUILT TO LAST - Premium aluminum shaft with brass accents for a lightweight yet robust feel.
POCKET SIZED POWER - Sleek 91mm length designed to slip effortlessly into your business card holder or notebook.
PRECISION IN EVERY STROKE - Experience ultra-fine 0.5mm ballpoint for crisp, professional lines.
SMOOTH OIL BASED INK FLOW - Low-viscosity ink ensures fluid writing without smudges or skips.
ALWAYS READY ALWAYS RETRACTABLE - Side-button retractable mechanism keeps your pen protected and instantly accessible.

The Auto NBP-505MN-BK is a Japanese-engineered, retractable oil-based ballpoint pen featuring an ultra-fine 0.5mm needle tip. Its compact 91mm length and slim profile allow it to fit seamlessly into business card holders or notebooks, making it the ultimate portable writing tool for professionals. Crafted from durable aluminum and brass, it delivers smooth, crisp lines with low-viscosity ink, combining elegance with everyday practicality.

Specifications

ASIN	B00BS52V94
Additional Features	Pocket Clip, Refillable, Retractable
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#230,603 in Office Products ( See Top 100 in Office Products ) #5,952 in Ballpoint Pens
Body Shape	Round
Brand	OHTO
Brand Name	OHTO
Closure Type	Retractable
Color	Black
Customer Reviews	4.4 out of 5 stars 799 Reviews
Drill Point	Extra Fine
Grip Type	Smooth
Hand Orientation	Ambidextrous
Hardness	3
Included Components	Lead Holder
Ink Base	Oil
Ink Color	Black
Item Diameter	0.1 inches
Item Dimensions	3.58 x 0.02 x 0.02 inches
Line Size	0.5 millimeters
Manufacturer	オート
Material	Aluminum Brass Polypropylene
Material Type	Aluminum Brass Polypropylene
Model Number	Minimo
Pattern	single item
Recommended Uses For Product	Writing
Unit Count	1 Count
Writing Instrument Form	Ballpoint Pen
Writing Technique	ballpoint

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