Fisher SPR4 Space Pen Pressurized Ballpoint Ink Refill, Medium Point, Pack of 3, Black Ink

I keep a small Fisher space pen in my wallet. It's an excellent pen for everyday use. I keep it in my wallet in case I need to jot a quick note, address a letter, or the waiter forgets to bring a pen with the credit card receipt. It just works and most of the time I forget it's there. I realized in 2021 the same pen has been in my wallet since 2005.The embarrassing admission: When I realized I never refilled my pen ink after 16 years I ordered these refills. When they arrived I looked at the package, saw they were too long for the pen and cursed my not noticing when I ordered them. I kept them because they were just too small an item to bother returning. I figured maybe someday I'd get a full size Fisher pen. This month I found them in a junk drawer and realized the plastic bit that made the refill "too long" wasn't attached. It's needed for the full size pen, not the small one I ordered it for. By the way, the pen I ordered the refill for STILL hasn't run out towards the end of 2024.

I received the Fisher pen as a gift, and I prefer getting their proprietary ink refills from the manufacturer. The refills perform in any environment, and never fails. Excellent product!

Just plain works anywhere and one refill will last until the moon falls out of the sky.In fact I am never without the Fisher Space Pen (3-3/4 inches closed) in my pocket. An engineering marvel. Thanks Fisher.

These refills keep them going for years and years. You will not be disappointed.

These refills, with their included plastic spacer, work very well in my Rotring 600, which takes Parker and Parker-compatible refills. However, at some point in the past few years, Parker must have adjusted their click mechanism slightly because these refills no longer work in a brand new Parker Jotter. They fit just fine, but when you click the button to write, the nib immediately disappears back into the pen body. Somehow the teeth to rotate the cartridge into the extended position must not be lining up with the mechanism. It's a bit disappointing, but I'm only knocking one star off the review because I'm blaming Parker for changing the rotation mechanism on their pens.

This refill works great. My husband uses it in his uzi pen and loves it. It writes on just about anything and from any angle. It flows with ease and there is no leakage. He was tired of his pen needing to be scribbled with before writing to get it started and sometimes skipping. But this refill works every time.

Product fit my Sensa pens. I've had these in the past and the ink flow is great and of good quality.

These refills last a long time and work great. Other pens run dry when inverted for a short time, but these never do.