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 like an astronaut, impress like a pro.

WRITE BEYOND LIMITS - Fine blue ink that flows flawlessly even upside down or in zero gravity.
BUILT TO LAST A LIFETIME - All brass and steel construction ensures rugged durability and timeless style.
EXTREME TEMPERATURE PROOF - Reliable performance from freezing cold to scorching heat, perfect for any environment.
LIFETIME GUARANTEE INCLUDED - Confidence in quality with a lifetime warranty against manufacturing defects.
PRECISION TESTED FOR PERFECTION - Each refill is hand-tested and guaranteed to perform flawlessly every time.

The Fisher Space Pen Ballpoint Refill in fine blue ink is engineered to write smoothly at any angle—even in zero gravity—and withstand extreme temperatures from -30°F to 250°F. Crafted from durable brass and steel, each refill is precision assembled, hand-tested, and backed by a lifetime guarantee, making it the ultimate versatile writing instrument for professionals who demand reliability and style.

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Manufacturer	Fisher Space Pen
Brand	Fisher Space Pen
Model number	SPR1F
Product Dimensions	8.89 x 0.51 x 0.51 cm; 14.17 g
Color	blue
Material Type	Brass Alloy steel
Number of Items	1
Size	1 Count (Pack of 1)
Point Type	Fine
Ink Color	Blue
Manufacturer Part Number	SPR1F
Item Weight	14.2 g

Fisher Space PenBallpoint Refill Fine Blue/Sensa&parkr

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