Uni Signo RT1 Gel Ballpoint Pen Black Ink Refills, 0.28mm, Set of 4

There isn't really much more to add. These pens are great, second to none. The fact that I don't have to throw away more plastic into a landfill when they inevitably run out is just the cherry on top!Buy this!

Works perfectly in my Signo pen, which I love. Very "fine" ink flow makes writing in very small print possible, much to the consternation of people who try to read what you're writing while you're in a public place, lol. This refill is as stated in the product info: for Uni-ball Signo RT1 Gel Ballpoint pens; it is extremely easy to replace the old cartridge with the new one - just slips into the pen.

I love these pens so much and the refills have been a godsend. I didn't want to be wasteful and buy new pens so I was relieved when I was able to find these refills.

The refills are exactly like the original and they fit and write exactly in my pens as expected, no problems at all.Delivery was faster than estimated. All-in-all, I am totally satisfied and have already bought other items from this seller.

will be buying again!

Use care. Fits ONLY Uniball RT Signo retractable pen....not any Uniball Signo 0.28 mm pens. Advertised as refill for Uniball Sign 0.28mm. Misleading.

Great product