Pentel EnerGel RTX Gel Pen - Navy Blue, 0.7 mm

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).