Fisher Pressurized Ballpoint 1950s Paper Mate (F, M) Refill

• Length: 106.8mm (4.2″)
• Manufacturer’s website: Fisher Space Pens

The Fisher Pressurized ballpoint 1950s Paper Mate refill is designed to fit most old-style retractable pens that take a stick refill. It comes with a spring and crimped shoulders to press the spring forward. It can write upside-down or in Zero-G situations. This refill is available in black or blue ink in a fine line width and blue ink in a medium line width. Monteverde and a couple other refill makers still offer non-pressurized substitutes for this refill.