Uni-ball Signo Bit UM-201 Gel Ink Pen - 0.18 mm - Black

Yes, it's a specialized pen, and I don't think it would be comfortable for extensive writing sessions. (I'd suggest the Hi-Tec-C .25mm for that.) But I needed something this fine for annotations and small details in my sketchbooks. This pen has performed beautifully for three years now, on a variety of papers. A big plus for me is that the ink is absolutely waterproof, unlike the Hi-Tec-C's. So I can go over my drawings with watercolors without any fear of the color running.

Nice pen to own. .18mm size requires a slower hand to lay down proper ink flow but with patience is well worth the payoff. Unique +

I was very excited to get this pen but frankly I was extremely disappointed. Although the pen tip is extravagantly thin which I like about it, it barely writes. The ink only comes out for portions of the time which really makes this pen inconvenient and hard to use. Truly a waste of money.

I bought this pen because I happen to write small. (Less than 1mm text height to put this into perspective.) It definitely does its job very well as a small writing pen. I use this for all my classes, from writing notes between lines and writing entire essays on 6 lines of wide ruled paper.

Pros:
- The thin tip enables you to write thinner, smaller, and also in between lines.
- It also has excellent ink flow so you can write pretty fast with a pen this thin.

Cons:
- It runs out of ink rather quickly. Buy lots of refills if you want this pen to last. In my opinion, it's a price I'm more than willing to pay to write this small.
- If the pen is dropped tip first, it may start to bleed out ink. Not only will that make your line thicker than 0.18mm, it will waste ink as you write.

As a side note, if you lend these pens out to other people, tell them not to write on their hands if they are heavy handed. (They’ll cut themselves.) Also, some students (AP students in particular) may want to buy these pens from you. Either redirect them to this website or buy some extra to give away or sell.

This is my favorite pen. I would use an even finer tip pen if I could find one. I use it for journaling because I like the way it looks with a full page of text.

I am very sad to see the blue color go away. I would like to see more colors, not fewer. It would be even better if this company would make this tip available in a more substantial, aesthetically pleasing body or really great to see them make the refill to fit other companies pens.

If everyone would write to the manufacturer maybe this pen will not disappear from the market.