Pilot Hi-Tec-C Coleto Gel Ink Pen Refill 0.5mm, 5 Set Black (Japan Import) by Hi-Tec-C Coleto

These are my favorite for multi-colored pen as an RN. They write very smoothly, can be ordered in various thicknesses (I like very thin), smudge very little, and are vibrant colors so even light colors show well. The black has a rich black color, but still very thin. I just wish the refills held more ink.

I am a huge fan of pilot hi-tec c coleto's!! I am an even bigger fan of bundle deals! So put those two together and I am one happy camper! I personally use my hi-tec c coleto for note taking in school, so as you can imagine, I burn through these black ink cartridges. These cartridges are excellent because they are kept fresh with a little red dot on the tip so that the ink doesn't dry out during transportation! I also feel that this nib allow the ink to flow more smoothly when you first start writing as it hasn't already previously flowed through the tip and allowed the tip to get gunked up during the shipping process. I will continue to buy these for as long as I am in school!

I love these multi-pen refills! Makes my life easier at work! Smooth writing, no skipping.

I use to be a BIC 4color color user but over the past year, I switched to the Pilot Coleto pens and ink refills.In general, all the refills I have used are great.

These refills are by far my favorite refills as of yet! They are very black and don't bleed through the thinnest of my papers, which is rare among gel pens for me. Another reviewer did say that these use up quickly and YES, they do. I go through these so quickly that I have to make sure to keep a pretty large stock available at all times... I write pretty much every day with these refills and they probably last me about 2 weeks. Perhaps if you are planning on using these less frequently, they will obviously last you quite a bit longer.They don't smudge unless you rub the ink with something damp (duh), but that is typical for most gel inks.Overall I recommend these refills! I wish they could hold more ink, but that is a drawback of such a fine tip.