Mitsubishi Pencil Uni-Ball One UMNS38.7 Gel Ballpoint Pens, 0.01 inches (0.38 mm), Green Black, 10-Pen Box

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.

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.

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.

Looks like bright pink. Good fine tip

Been through 2-3 of these so far, mostly to replace the barrels in my Uniball One P’s. It hasn’t been long, but I do take a lot of notes sometimes. I say I can go through one in a week or so if I go at it. Thus, this is a great deal at about $1 a refill and a much more economical choice than replacing the entire pen. The refills look just like the ones that came in the pens, only with a different stamped date. Furthermore, the ink is just as dark as the original ones and write just as smoothly. These will make my favorite pens last forever and won’t break my bank.

Although the ink runs out quickly, that is not the fault of the refills. They work amazingly and allow me to use my favorite pen.

So I love my uniball one p pens. Well, I accidentally broke the tip to my new pen. So I purchased these to have extra just in case. Well, at first I thought they wouldn’t fit, since the pen is so small. Haha it definitely fits. So happy that I can use my pen again. I would love it if they sold different color inks for them also.

Favorite pen I bought in Japan. So glad to have found refill ink!! Super sharp and clean.