Five functions in one pen: It features a 4-color oil-based ballpoint pen (black, red, blue, and green) and a mechanical pencil. "Addictive, smooth writing feel": It uses ultra-low friction Jetstream ink, allowing for clear and dark lines even with light pressure. Excellent quick-drying properties: It is resistant to smudging even when touched immediately after writing, making it suitable for use in planners and documents. Sophisticated design: It features a simple and calm barrel color (image is black), fitting well in business settings. Convenient portability: You don't need to carry multiple writing instruments, as this one pen can handle many uses.