Schneider Topball 850 Refill in Euro-Format for Ink Roller Pen 0.5 mm Blue Pack of 10

Correct size, does the job.

Fitted my pen works well

I found them to work very well, and got them at a very good price. I have a vintage waterman set with a fountain pen and a ballpoint; I use blue ink for my fountain pen and this red refill for my ballpoint in my teaching work, would highly recommend! I'm still on my first refill with over 2 months of decent use.

Good quality pens, fit well in my pen. Not a real problem, but the inner packaging looked rather tatty and bashed, but no real issue there

Good price value.

These refils are high quality and write just as well as the old ones. I find them very useful to relpace any pens that previously had this ink in it. The pen flows nicely and writes very smoothly. I was worried about these being fake but actually they are originals. You can tell from the writing on the ink refil that is exactly the same as the original.

And it works well. I can't find my pen style anymore, but these refills worked well and still in use.

I received a pen as a gift a few years ago and only recently have started to use it. As it hadn't been used the original refill had dried out . It was good that I could find the refill type as I had not heard of them before and they were reasonably priced. the only thing that I have found is that they are a little "sctratchy" when first used but are fine after this initial use.