Four colors with one click. Sometimes it’s helpful to highlight certain aspects of your notes and drafts in different colors. This helps to emphasize highlights and clarify relationships. The BiC 4-color pen was designed specifically for this purpose: thanks to the four built-in ink cartridges in red, blue, green, and black, you can switch your writing color with a simple click. Instead of searching for a pen in another color, the color change takes no longer than a fraction of a second. Convenient, isn’t it? Write and highlight with different colors!.