Marketed as the "World's Thinnest Pen", I was anxious to give the Uni-Ball Signo Bit 0.18mm pen a whirl, and I was pleasantly surprised. I didn't have very high hopes after using the 0.38mm version of this pen - it is fine, but tends to clog easily, causing me to stop and start frequently - but the 0.18mm version seemed to not clog as much. This model is delicate, as you can imagine, but if you just watch the pace you are writing or drawing at, I think you will like it.
Review: Pilot Choose 0.5mm Black
This is a pretty cool pen. The tip is just a standard 0.5mm gel ink rollerball, but it writes very well, is very comfortable, and is very nice looking for such a simple design. The barrel is perfectly round and smooth, similar to the old standby Bic Round Stic ballpoint pen. JetPens.com carries all 12 colors in both 0.5mm and 0.7mm widths.
