Uni-Ball AIR Micro, 0.5mm Fine Rollerball, Pack of 18, Black (18)

I like this pen as it's smooth, and doesn't smudge. When writing notes for work and need to stop to highlight, no smudging.

So, don't buy these used, I got a box full of random garbage pens... But this is a rating of the product, not poor QC Uniball had no control over. The ink is waterproof and doesn't budge when I use watercolour with it; it has a fine point, but is kinda like a ballpoint when you press down, it has a thicker line. Smooth writing, almost as good as my fountain pens, and on e the ink dries, it doesn't go anywhere. It's good for writing and drawing, and the ink lasts quite a while considering how much I sketch.

I use these pens for art journaling and they are perfect for that! They write over any medium and the tip can take a lot. It writes pretty smoothly and the pens last a long time. I put it over other art mediums so I always let it dry but it has not smudged on me.

I love these pens, they write very smooth.

I've been a repeat buyer of these for years. They have some unique characteristics that aren't found elsewhere. 1. Variable line width and darkness depending how hard you press and the angle of the pen. 2. Extremely light lines can be made by skimming the pen. Few rollerballs do this. 3. Extremely fast and light crosshatching or filling in...more like a fountain pen. 4. Very reliable pen flow in old pens that have sat in a drawer waiting to be used. One caveat: unlike most rollerballs, this type of pen will happily continue to stain your shirt or pants if it gets uncapped inside a pocket. The ink will flow and flow, and it's impossible to clean. Since it's a cap not a click pen, this will assuredly happen if you use this one as a normal writing and work pen. This is an art pen, not a work pen as uniball sells more appropriate pens for that usage.