Is there a difference between the spr4 and the pr4?

The "PR" stands for Pressurized Refill and the PR4 is the black refill that fills most of the standard Fisher Space pens and other similar pens. If the code ends in a "B", then it's a bold, or ends in a "F" then it's a fine point. The numeric value after the PR indicates the color (1= blue 2=red, 3=green, 4=black, etc. I believe that the "SPR" simply means that the package includes the little plastic adapter piece that makes the refill Parker compatible. All my refills are the SPR version and work in either Fisher Space Pens (without the plastic adapter) or in my Parker Jotter pens (with the adapter). BTW - Fisher also makes refills with a label "C" like C1 or C4 which are for Cross pens.

Will this refill work in a Bullet space pen?

Greg K,This refill does work correctly in several Bullet Space Pens I purchased!

What is the tip size? I like a solid 1.0, would that be medium or bold?

I would have to say this is more of a medium than a bold. Most 1.0 pens that I have purchased like the Pilot G-2 or Uniball 207 Gel Impact are bold, which I prefer. The Fisher Space Pen refill is less so to me, but still good. What I REALLY like about the Fisher is how exceptionally smooth the ink flow is.

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Fisher Ballpoint Pen Refill, Black (B) Bold Point

Fisher Ballpoint Pen Refill, Black (B) Bold Point

Product ID: 738532410

Details

Brand
Fisher
Item Weight
0.01 Kilograms
Item dimensions L x W x H
8.9 x 0.5 x cm
Number of Pieces
1
Style
Ball Point

📏Compact 3.4-inch refill fits most Fisher pens

🖤Rich black ink for professional clarity

🖊️Bold point for crisp writing

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€ 15.09

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In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖊️ Elevate your pen game—because your ideas deserve bold clarity!

TRUSTED BESTSELLER - Join thousands of professionals who rely on this top-rated refill with a 4.6-star average.
SLEEK COMPACT DESIGN - At just 3.4 inches, this refill fits seamlessly into your favorite Fisher pen.
LIGHTWEIGHT DURABLE - Weighing only 0.01 kg, it offers effortless writing without compromising longevity.
BOLD PRECISION WRITING - Experience sharp, confident strokes with the bold point tip.
PROFESSIONAL BLACK INK - Deep black ink ensures your notes and signatures stand out with clarity.

The Fisher Ballpoint Pen Refill in black features a bold point tip for sharp, clear writing. Measuring approximately 3.4 inches, it fits most Fisher pens and delivers smooth, professional-grade ink. With a 4.6-star rating from over 10,000 users, this lightweight and durable refill is a trusted choice for office professionals seeking reliable performance.

Specifications

ASIN	B000FTGCFI
Amazon Bestseller	#16,836 in Office Products ( See Top 100 in Office Products ) #548 in Ink Pen Refills
Brand Name	Fisher
Customer Reviews	4.6 4.6 out of 5 stars (10,595)
Global Trade Identification Number	00747609113419
Ink Color	black
Item Dimensions	8.9 x 0.5 x 0.5 cm
Item Weight	0.01 Kilograms
Manufacturer	フィッシャー(Fisher)
Manufacturer Part Number	SPR4B
Model Number	SPR4B
Number of Pieces	1
Point Type	Bold
Style	Ball Point
UPC	747609113419
Unit Count	1.0 Count

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