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 Ballpoint Refill Fine Blue/Sensa&parkr

Fisher Ballpoint Refill Fine Blue/Sensa&parkr

Product ID: 49993796

Details

Brand
Fisher Space
Item dimensions L x W x H
8.9 x 0.5 x
Item weight
14 g
Number of pieces
1
Style
Ball Pen

🌊Writes underwater & upside down

🖊️Fine 0.7mm line width

❄️🔥Operates -35°C to +120°C

R408

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Description

🖋️ Never miss a line, no matter where life takes you!

ADVENTURE READY - Perfect for travel, workshops, expeditions, and daily hustle
PRECISION BLUE INK - Fine point delivers crisp, professional lines every time
UNMATCHED DURABILITY - Sealed gas pressure system ensures leak-proof, long-lasting use
EFFORTLESS COMPATIBILITY - Fits all Fisher Space Pen models for seamless replacement
WRITES ANYWHERE ANYTIME - Reliable ink flow in zero gravity, underwater, and extreme temps

The Fisher Ballpoint Refill Fine Blue SPR1F is a high-quality, gas-pressurized pen refill designed to perform flawlessly in extreme conditions—from freezing cold to scorching heat, underwater, and even in zero gravity. Compatible with all Fisher Space Pens, it offers a fine blue line with leak-proof durability, making it the ultimate choice for professionals and adventurers who demand reliability and precision.

Specifications

ASIN	B00168YNEO
Best Sellers Rank	15,034 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 125 in Pen Refills
Brand	Fisher
Brand Name	Fisher
Country Of Origin	United Kingdom
Customer Reviews	4.6 out of 5 stars 3,828 Reviews
Global Trade Identification Number	00747609111118, 07476091111186
Included Components	9004524
Ink Colour	Blue
Item Dimensions	8.9 x 0.5 x 0.5 centimetres
Item Type Name	Refill Blue Ink Fine Point SPR1F
Item Weight	0.03 Pounds
Item dimensions L x W x H	8.9 x 0.5 x 0.5 centimetres
Item weight	0.03 Pounds
Manufacturer	OfficeCentre
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
Product Warranty	2 year manufacturer
Style	Ball Pen
UPC	097914378943 047609111119 747609111118
Unit Count	1.0 count

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R408

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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