Uni Jetstream inks are touted as enabling "smooth writing that becomes a habit." In one pen body, this pen combines three incredible Jetstream inks: black, blue, and red. The oil-based ink 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 flow, density, and colour pigment, and it dries quickly.