I should begin by saying that I own 2 Faber-Castell (refillable) ballpoint pens that I absolutely love. The first one I bought from Indigo. I loved it so much that I bought a 2nd one here from Amazon Canada. The only thing is, I couldn't seem to find a blue pen refill for them at either store! So I found this fantastic article online that matched whatever pen brand you own to the size (length) of the pen refill. Then I decided that rather than go to a specialty pen store where I'd pay a fortune for 1 refill (!), I'd order it online. It helps that the subheading clearly gives the exact length of these pen refills, so I already knew the refills would fit. I just wasn't sure about the quality. These are great! My pens continue to write like a dream: no blotches/spatters, no "skipping" of ink, just a fantastic writing experience. Don't hesitate to buy these--unless, of course, you've figured out they won't fit your pen(s)! Otherwise, I highly recommend these for Parker pens and, now, Faber-Castell pens too.