Fisher Space Pen Cap-O-Matic Space Pen USSF M4B-SFD - Writes Upside Down Under Water In Extreme Conditions

The Fisher Space Pen Cap-O-Matic USSF M4B-SFD is a compact, reliable writing tool designed for professionals who operate in tough conditions—and for Space Force enthusiasts who appreciate the USSF branding on the barrel.

• Length: 5.25" overall for easy handling and pocket portability
• Finish / Color: Matte black barrel with a prominent USSF logo for a bold, official look
• Ink: PR4 black ink in a medium-point cartridge for smooth, legible lines
• Extreme-writing capability: Writes upside down, at any angle, underwater, over grease, and in extreme temperatures
• Pocket clip: Built-in clip keeps it accessible on pockets, notebooks, or gear
• Packaging: Boxed, ready for gifting or safe storage

Designed to meet the needs of field technicians, researchers, and professionals who can't compromise on writing reliability. The pressurized PR4 cartridge delivers consistent ink flow regardless of position or environment, while the matte finish resists wear and the barrel branding nods to space work heritage. The compact size makes it easy to carry in a pocket or clip to a notebook, ensuring you always have a dependable pen within reach.