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 Space Pen Fine Point Pressurized Cartridge Refill, Blue Ink, 1 Pack

Product ID: 4839689

Details

Brand
Fisher Space
Item Weight
13.61 g
Item dimensions L x W x H
3.5 x 0.2 x
Number of Pieces
1
Style
Fine Point

🚀Pressurized cartridge writes in zero gravity

🖊️Fine point precision

❄️🔥Operates from -30°F to 250°F

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Description

🖋️ Elevate your writing game—space-tested ink for earthbound pros!

VIBRANT BLUE INK - Fine point blue ink delivers crisp, professional lines that stand out in any setting.
TEMPERATURE TOUGH - Writes flawlessly from freezing cold to scorching heat, no matter the environment.
SPACE GRADE RELIABILITY - Trusted by astronauts and professionals for flawless performance in extreme conditions.
UNIVERSAL COMPATIBILITY - Fits all Fisher Space Pens (except Infinium & Stick), making refills effortless.
WRITE ANYWHERE ANYTIME - Smooth ink flow at any angle—even upside down, defying gravity.

The Fisher Space Pen Fine Point Pressurized Cartridge Refill features a blue ink cartridge engineered to write smoothly at any angle, including upside down, and in extreme temperatures ranging from -30°F to 250°F. Compatible with most Fisher Space Pens, this refill is trusted by astronauts and professionals alike for reliable, high-performance writing in harsh environments.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	#94,072 in Office Products ( See Top 100 in Office Products ) #652 in Ink Pen Refills
Brand Name	Fisher Space Pen
Customer Reviews	4.7 4.7 out of 5 stars (4,031)
Global Trade Identification Number	00747609111118, 07476091111186
Included Components	9004524
Ink Color	Blue
Item Dimensions	3.5 x 0.2 x 0.2 inches
Item Weight	13.61 g
Manufacturer	Fisher Space Pen
Manufacturer Part Number	SPR1F
Model Number	SPR1F
Number of Pieces	1
Package Size Name	Single
Point Type	Fine
Style	Fine Point
UPC	097914378943 047609111119 747609111118
Unit Count	1 Count

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€ 35.73

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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