Fisher Space Pen Antimicrobial Raw Brass Cap-O-Matic ballpoint pen with chrome-plated clip, model M4RAW, in a gift box

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Fisher Space Pen Cap-O-Matic M4RAW Ballpoint Pen – antibacterial untreated brass

The Cap-O-Matic M4RAW model is made from 85% copper alloy and 15% zinc alloy. This combination provides natural antibacterial properties and protects against microorganisms.

The barrel is made of untreated brass, which develops a beautiful patina over time. The pen is activated by pressing the barrel once – with just one hand.

Why choose this pen

One-handed activation by pressing the barrel
Antibacterial body made from a copper-zinc alloy
Writes at extreme temperatures from -34°C to +120°C
Works underwater, at any angle and in zero gravity
Tungsten carbide tip
Thixotropic ink – solid at rest, liquid when writing
Writes up to 3 times longer than standard ink
The refill contains a pressurised nitrogen cartridge
Clip for attaching to a pocket or rucksack
Compact – easy to carry in a wallet or organiser
The pen does not leak or run out
Comes in an attractive gift box

Precision and a lifetime guarantee

Every Fisher Space Pen is hand-tested and comes with a lifetime guarantee against manufacturing defects. The construction features brass and steel.

This model is suitable for military personnel, doctors, rescue workers, builders and anyone looking for a reliable writing instrument.

An excellent gift for men and women

The pen is practical and durable, whilst its history and technology make it an interesting topic of conversation. It is suitable for teachers, doctors, lawyers, business leaders, military personnel, school leavers and anyone who values quality.

It doesn’t freeze in winter or leak in summer – it’s reliable in all conditions, including in the car or your everyday bag.

History of the Fisher Space Pen

During the early NASA missions, astronauts used pencils. For the Gemini programme in 1965, NASA purchased 34 mechanical pencils at a total cost of $4,382.50 – around $128.89 each. This caused public outcry due to the high price.

Paul S. Fisher of Fisher Pen Co. developed a ballpoint pen suitable for the unique space environment, without funding from NASA. The company invested around $1 million of its own funds, patented the product and brought it to market.

In 1967, following rigorous testing, NASA approved the pens for the Apollo programme’s astronauts. Around 400 were purchased at a price of $6 each. In February 1969, the Soviet Union also purchased 100 pens and 1,000 refills for the Soyuz spaceflights. To this day, American astronauts and Russian cosmonauts use Fisher Space Pens.

Specifications	Value
Brand	Fisher Space Pen
Model	Cap-O-Matic M4RAW
Length	13.4 cm
Barrel material	Unfinished brass (85% copper alloy, 15% zinc alloy)
Construction and finish	Brass and steel
Cartridge tip	Tungsten carbide
Cartridge	SPR4 – black, medium thickness
Ink type	Thixotropic, nitrogen-pressurised
Mounting bracket	Clip
Operating temperature	-34°C to +120°C
Warranty	Lifetime
Packaging	Gift box

Frequently asked questions

What makes the Fisher Space Pen Cap-O-Matic M4RAW antibacterial?

The body of the M4RAW model is made from an alloy containing 85% copper and 15% zinc. Copper is known for its natural antibacterial properties – it inhibits the growth of microorganisms on surfaces. This makes it suitable for people who prioritise hand hygiene, including healthcare professionals and those who come into contact with many surfaces. The antibacterial effect stems from the material itself, rather than from an additional coating.

What is thixotropic ink and why is it better than ordinary ink?

Thixotropic ink is a special formula which, when at rest, is in a solid or gel-like state, but when subjected to mechanical stress – that is, when writing – liquefies and flows evenly. This means that the pen does not leak, does not leave smudges and does not skip. Furthermore, the cartridge is hermetically sealed and pressurised with nitrogen, which allows you to write at any angle, even with the pen pointing downwards. The ink lasts up to three times longer than standard ballpoint pen ink.

Can the pen write at low temperatures and in the rain?

Yes. The Fisher Space Pen Cap-O-Matic M4RAW is designed to operate at temperatures ranging from -34°C to +120°C. The cartridge is hermetically sealed and functions underwater, in the rain and in extreme cold or heat. It does not freeze in winter or run in summer temperatures. It is precisely these qualities that make it the preferred choice for military personnel, rescue workers, police officers and people working outdoors.

What warranty is offered with the Fisher Space Pen?

Every Fisher Space Pen is hand-tested and comes with a lifetime guarantee against all manufacturing defects. This is a testament to the quality and precision with which these products are manufactured. The warranty covers defects in materials and workmanship, but not normal wear and tear.

Is this pen suitable as a gift?

Yes, the Fisher Space Pen Cap-O-Matic M4RAW is an excellent choice for a gift. It comes in an attractive gift box and combines practicality with an interesting history and unique technology. It is suitable for men and women in a variety of professions – doctors, lawyers, military personnel, teachers, business leaders, police officers and school leavers. The untreated brass develops a beautiful patina over time, making it increasingly distinctive and valuable to its owner.

How do you activate the Cap-O-Matic pen?

The Cap-O-Matic model is activated by pressing the barrel – an action that can be performed with just one hand. This is particularly convenient in situations where the other hand is occupied – for example, when working in the field, in an operating theatre or on a building site. The mechanism is simple, reliable and does not require the cap to be removed.

What type of refill does the M4RAW model use, and can it be replaced?

The pen comes with an SPR4 refill in black with a medium line width. The refill contains a pressurised nitrogen gas cartridge and a tungsten carbide tip. Fisher Space Pen refills are replaceable, meaning the pen can be used for a long time. When the ink runs out, you simply need to replace the refill without having to buy a new pen.