Pack of 6 - Schmidt 888 M Safety Ceramic Rollerball Refill Blue/Black Ink Medium Tip

This are an exact replacement for the originals. Working perfect,no issues at all.

If you have a fine pen that uses this refill and you can still write, these are for you. The ink flows nicely and doesn’t spill. A good pen is good for you brain, hand and soul. Goosenest rating; buy with confidence

I bought this refill to use in a pretty pen i had. I didn't know the size i needed. These are great pens. Write nice. Came fast. It just doesn't fit. It's off by a pinch. Still a great product. I would recommend these refills . The error was mine . 👍

Best riding refill available to my knowledge My only negative comment is that I was not able to get a pack of all six being blue. I got three blacks and three blues.

These refills work great. The ink does not smear, and the color matches the ink that came in the original cartridge. Very good price and the quality is great.

Perfect fit for so many odd pens I've collected of the years. A very common form factor apparently.

I did some research and it turns out the Schmidt brand is the gold standard for pen cartridges. The ink is bright, thick, and flows smoothly and consistently. No matter how fast I write, it leaves a nice, clear line (the other brand I used often skipped or the ink line got thinner the faster I wrote.) It even works if there is skin oil on the paper (some pens can't deal with that, so skip.) Smooth roller ball action. I like the medium tip as it produces a reasonably thick line.

These things seem to run out really fast