The ink works great

nice ink, i like it alot.

The fine point refill does not flow ink as well.

ink is not dark enough

Super smooth writing, dark, rich ink evenly applied.

Ink is faint.

Super smooth writing, dark, rich ink evenly applied.

I think there is a website called "spacepen(dot)com" that has page after page of pen-body options for this famous ink cartrige

Best ink ever!!

Great ink flow, but sometimes would glob ink onto the paper, especially when you make the first mark after the pen had been sitting for a while.

Smooth roller in ball point and very consistent ink output with no leaks or gumming up issues

Although it is a little pricey it is definitely worth the price to have a good dependable ink refill.

The ink was a bit blotchy at the

Awesome ink cartridge

With any point but the fine point, I have found the ink smears and smudges (although the manufacturer denies this allegation).The refills fit Parker type pens using a plastic extension that comes with the refills

The original ink would sometimes not work and would ooze out and cause globs every now and then.

Best ink I've ever used.

To clarify, after some use, the Space Pen seems to collect ink at the tip when idle

The ink is pretty awesome

The ink works great, as well as the original ink.

The ink works great, as well as the original ink.

I have enjoyed the Fisher Space Pens (specifically the SPR4F Black Ink Fine Point Refill) for some time now.

the ink doesn't blur when I have to place labels under water

and I noticed that if I roll the ball one direction the ink is more faint vs. rolling it the other direction.

This ink writes well, and in basically any scenario and environment

Fantastic ink refill, I love that it writes on anything

oh it's just so great and lovely i just loooove this product