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

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 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.

Absolutely LOVE these pens. They are beautiful and the ink fliws like a dream. I've bought several as gifts that were well received.

Buyer beware. Look very carefully at the cartridge that you are replacing. These refills worked fine on one of my pens but did not fit the other because of the thicker plastic neck. It appears negligible but it made the difference between success and failure. In terms of writing, I like these refills because they are much bolder than scratchy fine points.

Writes easily and does not leak.

Recambio para mi bolígrafo Scriveiner no hay diferencia física ambos muy iguales lo único que quizás mi error es que el grosor de la punta/tinta es más gruesa que el original soy nuevo en todo esto, por lo que a lo mejor algún número de punta está la diferencia pero pese a ello no me molesta, estoy muy contento de volver a usar este bolígrafo le he dado mucho uso en mi trabajo que seguramente volveré a comprar este excelente producto.

These refills are a great value for the money. These are OEM refills and work perfectly.

Just Ok. Bought these to replace a the refill for a custom-made wood pen that was given to me as a gift. IT worked but was wasn't a silky-smooth writing experience I had better luck with pulling the refill out of an inexpensive retractable Gel Pen.