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.

Fisher Space Pen Ballpoint Refill Fine Blue Sensa And Parkr

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€ 38.24

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Description

🖋️ Write like a pro, anywhere, anytime—because ordinary pens just don’t cut it.

WRITE BEYOND LIMITS - Fine blue ink that flows flawlessly even upside down or in zero gravity—because your ideas don’t wait for perfect conditions.
SEAMLESS REPLACEMENT - Designed as the perfect refill for tactical and premium pens, ensuring smooth, long-lasting writing without interruption.
BUILT TO LAST A LIFETIME - Crafted with premium brass and steel, each refill is precision assembled and hand-tested, backed by a lifetime guarantee against defects.
TRUSTED BY PROFESSIONALS - With a 4.7-star rating from over 4,300 reviews, this refill is the go-to choice for those who demand excellence in every stroke.
EXTREME TEMPERATURE PROOF - From Arctic chills to desert heat, this refill performs consistently between -30°F and 250°F—reliability you can count on anywhere.

The Fisher Space Pen Ballpoint Refill Fine Blue/Sensa&parkr delivers unmatched versatility with its fine blue ink that writes at any angle—even in zero gravity. Engineered to perform flawlessly in extreme temperatures from -30°F to 250°F, this refill features durable brass and steel construction, precision assembly, and a lifetime guarantee. Perfect for tactical and premium pens, it’s a trusted choice among professionals worldwide.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	#3,516 in Office Products ( See Top 100 in Office Products ) #18 in Pen Refills
Brand	Fisher
Brand Name	Fisher
Customer Reviews	4.7 out of 5 stars 4,323 Reviews
Global Trade Identification Number	00747609111118, 07476091111186
Included Components	9004524
Ink Color	Blue
Item Dimensions	8.9 x 0.5 x 0.5 centimeters
Item Weight	0.03 Pounds
Item dimensions L x W x H	8.9 x 0.5 x 0.5 centimeters
Item weight	0.03 Pounds
Manufacturer	Fisher Space Pen
Manufacturer Part Number	SPR1F
Model Number	SPR1F
Number of Pieces	1
Number of pieces	1
Package Size Name	Single
Point Type	Fine
Point type	Fine
Style	Refill refills (PR series)
UPC	097914378943 047609111119 747609111118
Unit Count	1 Count

Reviews

K**T

Refill per penna tattica

Anni fa mi hanno regalato una bellissima penna tattica del marchio Colt che uso anche come penna in caso di necessità, da diverse ricerche sul web ho trovato che questi refill sono i migliori e adatti alla sostituzione dello slot dell'inchiostro e così è stato, è perfetta, per sfizio ho voluto provare il color marrone e scrive benissimo!

13.12.2019

R**R

Great refill for an even greater pen

Best pen out there. Writes on any and all surfaces and in any temperature and it's indelible. I just wish they offered an ultra fine point instead of just the fine point. Refill lasts a long time and is easy to buy and use.

25.04.2026

D**0

Great

Great original replacement

19.07.2026

B**L

Fisher space green refile

Rare in green

16.11.2021

C**S

Fisher Space Pens Are The Best

Fisher refills work any time anywhere. I use nothing else in all my pens.

6.06.2016

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