Pilot BRFN-10F Ballpoint Pen Refill - 0.7 mm - Black

Sure wish I could get these in 0.5 mm. Not sure why they switched to this shorter refill other then to make money.
I love the G2 refills which are used in many of their other pens.

There isn't a refill to compare with these, I use them in my Namiki Knight.

These are the best refills I have ever ordered. I could not be more pleased with how smoothly they write.

These are great refills. While not specifically referenced in the JetPens catalog, the ink seems to be a low-viscosity ink that flows much better than traditional ballpoint ink. It is comparable to Uni "Jetstream" ink. I find the Pilot ink actually flows onto the paper more smoothly and will less skipping than Uni's "Jetstream" pens.

These refills are write so nicely. It is so much better than the ones sold in the US. This was an awesome purchase.