Using these pens is super easy. Just click the top of the pen to switch between the 6 colors. You can use them for writing notes, making sketches, or highlighting important information. When checking out, don't forget to leave a note about which pen style you want. If you don't, we'll pick one for you. To keep your pen in good condition, avoid dropping it and keep it away from extreme heat or cold. And that's all you need to know to make the most of these awesome multi - colored pens!