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 Ballpoint Refill Fine Blue/Sensa&parkr

Product ID: 254895579

Details

Brand
Fisher
Item dimensions L x W x H
8.9 x 0.5 x
Item weight
14 g
Number of pieces
1
Style
Refill refills

🖊️Writes at any angle, zero gravity ready

🛠️All brass & steel, lifetime guaranteed

❄️🔥Operates from -30°F to 250°F

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Description

🖋️ Write beyond limits—because your ideas deserve a pen as versatile as you.

PREMIUM DURABILITY - Crafted with all brass and steel for unmatched longevity and style.
PRECISION FINE POINT - Delivers crisp, clean blue lines perfect for professional note-taking and signing.
GRAVITY DEFYING INK FLOW - Writes flawlessly at any angle—even upside down or in zero gravity.
LIFETIME GUARANTEED QUALITY - Hand-tested and backed by Fisher’s lifetime warranty against defects.
EXTREME TEMPERATURE RESILIENCE - Reliable performance from freezing -30°F to scorching 250°F environments.

The Fisher Space Pen Ballpoint Refill in fine blue ink is engineered to perform flawlessly in any condition—from zero gravity to extreme temperatures. Built with durable brass and steel, this refill ensures smooth, precise writing with a lifetime guarantee, making it the ultimate choice for professionals who demand reliability and style.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	#17,722 in Office Products ( See Top 100 in Office Products ) #137 in Pen Refills
Brand Name	Fisher
Country of Publication	USA
Customer Reviews	4.7 4.7 out of 5 stars (4,327)
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	14 g
Manufacturer	Fisher Space Pen
Manufacturer Part Number	SPR1F
Model Number	SPR1F
Number of Pieces	1
Package Size Name	Single
Point Type	Fine
Style	Refill refills (PR series)
UPC	097914378943 047609111119 747609111118
Unit Count	1 Count

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14120CFA

Duties & taxes included

In stock

Sold byAmazon CameroonDelivered 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 Cameroon.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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