ZenZoi Fountain Pen Ink Cartridge Refills- 24 Bulk Premium Blue Case- Professional Grade, International Size, Non-Toxic Ink- Smooth, Blotch-Free Writing for Luxury Pens – German Nibs (Blue)

Ink is smooth and gives no drag on the nib.

If you have paper that might get wet, be aware, this will run and blur like crazy (pretty much all fountain inks do this), but these cartridges are easy to change and the ink flows well in my ZZ pens.

I think it was my mistake though that I didn't know how to measure it well

This ink is so black and flows through the nib beautifully!

Good ink,looks good,Fry's fast.

lots of ink for my favorite pen

Labeled as Blue, but a very dark Blue/Black ink. It should be redescribed as being so dark. I am not using it and will simply discard it.

I ordered this product for a refill on my fountain pen. No doubt I expected to receive all 24 of them in tact, but instead what I got was a box that was soaked in black ink. When I eventually opened the box staining my hands, I found that half of the cartridges had emptied their contents over the box. I had to later sort the cartridges into empty and full. It averaged out to be about half of them were destroyed on arrival. Overall, don't buy them without knowing that you may not receive all of them intact.

Did not receive as advertised only 17 cartridges in package instead of 24 .