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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🖋️ Write beyond limits — the pen that defies gravity and time.

BOLD CLEAR - Bold point delivers striking black ink for professional, confident strokes.
EXTREME DURABILITY - Sealed pressurized ink cartridge ensures smooth writing in any environment.
CENTURY LONG SHELF LIFE - Ink stays fresh and ready for up to 100 years — write your legacy.
UNIVERSAL COMPATIBILITY - Plastic adapter fits any standard ball pen refill for seamless upgrades.
SPACE PROVEN PERFORMANCE - Writes underwater, in zero gravity, and extreme temperatures from -30ºF to +250ºF.

The Fisher Space Pen SPR4B refill is a 98mm long, bold black ink cartridge with a plastic adapter for universal fit. Its sealed pressurized ink system guarantees smooth writing in extreme conditions from -30ºF to +250ºF, underwater, and zero gravity. With an estimated 100-year shelf life, it’s engineered for durability and timeless performance.

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Manufacturer	Fisher Space Pen
Brand	Fisher Space Pen
Model number	SPR4B
Product Dimensions	8.89 x 0.51 x 0.51 cm; 10 g
Color	black/bold
Material Type	Plastic
Number of Items	1
Size	1 Count (Pack of 1)
Point Type	Bold
Ink Color	Blue,Black
Manufacturer Part Number	SPR4B
Item Weight	10 g

Fisher Space Pen SPR4B Point Pressurised Refill black/bold

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