The Uni-ball Signo 307 gel rollerball pen features an ergonomic body shape design together with the textured rubber grip, which make it very comfortable to write with. It also features a special cellulose nanofiber ink which provide you with a supper smooth and skip-free writing experience. The ink is also pigment-based ink which means it is water resistant, fade resistant and perfect for archival purposes. The pen is available in different tip sizes and ink colours.