Pentel EnerGel RTX Retractable Gel Pen, (0.7mm) Medium Line, Orange Ink

I have bought dozens of these pens in the last few years. It's enjoyable to write in different colors, and having the different colors makes it so much easier when I have to keep track of multiple categories of things or ideas. Their are well over over a dozen colors to choose from and the ink flows beautifully. They do have one downside: the ink is highly water soluble, so will smear of if it comes in contact with liquid. For me, however, this has been a minor issue.

I love the Pentel EnerGel RTX Sky Blue color. All of their colors hit the sweet spot for the color they represent: they are vivid enough to establish the reason for their own existence, but also very pleasant/soothing to the eyes. The Sky Blue color is exactly what it says: a lighter blue such as the sky, clearly lighter than their regular Blue color but still dark/bold enough to be easily readable and copyable on the copying machine. As all their other EnerGels, it writes smoother than a stick of butter (whether or not you're into writing with butter).