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

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

🌊Writes underwater & on almost any surface

🖊️Pressurized cartridge writes at any angle

❄️🔥Operates from -30°F to 250°F

Description

🪐 Write beyond limits with the pen that’s out of this world!

LONG LASTING INK - Durable cartridge lasts significantly longer than standard refills
WRITES ANYWHERE ANYTIME - Pressurized refill ensures smooth ink flow even upside down or underwater
EXTREME TEMPERATURE PROOF - Reliable performance from freezing cold to scorching heat (-30°F to 250°F)
SMUDGE RESISTANT BLUE INK - Quick-drying, permanent oil-based ink perfect for lefties and fast note-takers
TRUSTED BY PROS EXPLORERS - Used by astronauts, engineers, and adventurers worldwide

The Fisher Space Pen Fine Point Pressurized Cartridge Refill in blue ink delivers unmatched versatility and reliability. Engineered to write smoothly at any angle, in extreme temperatures (-30°F to 250°F), underwater, and on nearly any surface, this refill is trusted by astronauts and professionals alike. Its long-lasting, quick-drying oil-based ink resists smudging and evaporation, making it the ultimate choice for those who demand performance in any environment.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	#94,416 in Office Products ( See Top 100 in Office Products ) #693 in Ink Pen Refills
Brand	Fisher Space Pen
Brand Name	Fisher Space Pen
Customer Reviews	4.7 out of 5 stars 4,037 Reviews
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
Item dimensions L x W x H	3.5 x 0.2 x 0.2 inches
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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