Kuretake Zig Letter Pen CocoIro Pen Refill - Super Fine - Black

Of all the ink colors in this line, black is the smoothest I've used!
It does take some getting used to, but the tricks this pen can do are cool! Writes variable line widths, no skipping, smooth flowy ink, even when you write fast. Its not scratchy to me, and I am very picky about scratchiness (Hi-Tec C 0.25 mm, I'm looking at you!).
Writiing in English or Japanese (I can't write in any other languages but I'm sure it handles just the same) looks very pretty and you can even get a lttle fancy with your script uusing the Letter Pens, without even trying too hard.

Yes, you can use these refills alone without the pen body, but I suggest you get at least one pen body to try oout. I pprefer using the pen body not just the refill alone.
(aand, sorry for the typos, I'mtyping on my phone!)

The tip took a few paragraphs for me to get used to but now I love it. I think this will be my new favorite pen. The ink is smooth and doesn't bleed through. I bought this along with the pink body. I really like them both!

It took a while to get it writing at first, but now it's very nice! not too runny when I'm writing.

If you like this pen or not will depend on how hard you press when you write. I find this pen overly stiff and difficult to write with if I use my normal writing style, but I have a very "light hand". The ink flow and writing look much better when I press much harder then I prefer. The description here is "Super Fine" and the package is marked "Extra Fine", and I am judging the line weight to be .5mm.

If you have a "heavy hand" and have broken .5mm pencil leads, this may be the pen for you. If you have a light hand like me, and have never broken even a .3mm "B" pencil lead and find that .25mm (000) technical pens write very smoothly, then don't bother with this pen.

Would really help to have a pic of all the colors, since you now have quite a list.
Thanks for having so-o-oo-oo-oo-o many greate writing, drawing and drafting instruments available,
JetPens is the Best ! ! !