Multi-pen includes four incredible 0.5 mm pens (not just any pens, Jetstream pens) and a 0.5 mm mechanical pencil in one pen body! Smooth writing and sharp design come together with the creation of this multi-pen that is targeted towards business professionals and designers. This oil-based ink pen is water and light resistant and has an extremely low coefficient of friction. That means that the pen practically glides across the paper. Best of all, the specially formulated ink has good ink flow, density and color pigment and dries quickly.