The Pentel Presto is a popular pen for a few key reasons. First, the ink formula is white and super permanent. The ink will cover well over most surfaces. Once you get the ink flowing through the pen, it writes really smoothly. Second, the size of this pen makes it versatile and portable. It easily fits in your pocket. In addition, the metal point is nice for little details. And lastly, it's a pump action pen, but you can squeeze it to increase the flow.