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 Point Pressurized Refill, Black Bold - SPR4B- Perfect for Your EDC Pen

Product ID: 19162461

Details

Brand
Fisher Space
Item Weight
0.01 kg
Item dimensions L x W x H
3.5 x 0.2 x
Number of Pieces
1
Style
Bold Point

🔄Writes smoothly at any angle

🖊️Pressurized refill writes anywhere

❄️🔥Works from -30°F to 250°F

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Description

🖋️ Bold ink that conquers gravity and deadlines.

TRUSTED BY THE ELITE - Used by astronauts, engineers, and adventurers, this refill guarantees unmatched quality and dependability.
DEFY GRAVITY ANGLES - Effortlessly write upside down or at any angle—perfect for on-the-go professionals who never settle.
LIFETIME INK CONFIDENCE - Backed by a lifetime guarantee, this refill is your forever writing companion for every challenge.
EXTREME TEMPERATURE PROOF - Reliable ink performance from freezing -30°F to scorching 250°F, built for explorers and executives alike.
WRITE BOLD WRITE ANYWHERE - Pressurized cartridge ensures smooth black bold ink flow in any pen from the Fisher Space Pen line (except Infinium & Stick).

The Fisher Space Pen Point Pressurized Refill in Black Bold delivers smooth, reliable writing in any environment—from zero gravity to extreme temperatures (-30°F to 250°F). Compatible with most Fisher Space Pens (excluding Infinium and Stick), it’s trusted by astronauts and professionals worldwide. Featuring a pressurized cartridge, it writes boldly at any angle, ensuring your ideas flow uninterrupted. Backed by a lifetime guarantee, this refill is the ultimate upgrade for your everyday carry pen.

Specifications

ASIN	B000FTGCFI
Best Sellers Rank	#37,200 in Office Products ( See Top 100 in Office Products ) #208 in Ink Pen Refills
Brand Name	Fisher Space Pen
Customer Reviews	4.7 4.7 out of 5 stars (3,363)
Global Trade Identification Number	00747609113419
Ink Color	Black
Item Dimensions	3.5 x 0.2 x 0.2 inches
Item Weight	0.01 kg
Manufacturer	Fisher Space Pen
Manufacturer Part Number	SPR4B
Model Number	SPR4B
Number of Pieces	1
Point Type	Bold
Style	Bold Point
UPC	747609113419
Unit Count	1 Count
Warranty Description	Lifetime Guarantee

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VT6084

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered 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 Vanuatu.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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