Mitsubishi Pencil Uni-Ball One UMNS38.2 Gel Ballpoint Pens, 0.01 inches (0.38 mm), Yellow, 10 Pieces

One of the best pens and inks I have ever used. Doesn't smudge and writing comes out looking rich and deep. It is not very thick so the writing is dainty and neat. Small pens so small ink but makes it easy to use for smaller hands.

I love this pen ink refills. the ink does not smear and it makes my handwriting look neater than normal. The ink flows well and the refill is very easy to use for my pen.

Great product, arrived in good condition.

The box these refills come in came damaged and flattened, but that is probably the delivery guy's fault.The refills are fine and they do the job. I put them in my uniball one p and it's great. The ink does skip a little sometimes but it's not that bad and kinda to be expected with such a fine tip. Only con is they run out pretty fast so the refills are definitely something you should have on hand. I think they're worth the money and they fit great in the pen.

If you like the small fine line detail style of pen this is it. I am on my second back because my boys had to have one for them also and we have used a full pack. I have dysgraphia and the smooth flow and thin lines help make my writing more legible. I use this in my different @BigIdeaDesign pens.

Satisfied with this refill as it works with my favorite pen of the moment the Uniball One.

I was anxious it wasn’t going to fit because it looked different online vs the ink cartridge that came with my uniball ONE pen. Fits perfectly! Ink flow is great just as good as my first refill. I LOVE this pen so much. Nice to know i found good refills.

Very black ink!! Quality pen refills. They don’t skip and last quite awhile. One cartridge will last about 6 months of daily use, and I write a lot. Feel smooth and my favorite ink pens! Dries fast and doesn’t smudge.