Uni-Ball Air UBA-188L Rollerball Pen Medium 0.4 mm Blue Pack of 12

Freedom of a fountain pen with the security of a roller-ball with no leaks, the Air’s unique metal ball can move without friction when the pen is held at an angle Filled with Uni-Ball Super Ink, an advanced ink formula that bonds to paper fibers, fade resistant, water resistant, and acid free, resistant to chemicals that wash dye-based ink from checks Light pressure will give a finer line as ink is transferred by the ball itself, firmer pressure allows the ink to flow freely around the ball for a thicker line Average line width between 0.355mm and 0.55mm when varying with the pressure applied, making the pen perfect for writing or calligraphy, blue ink in a box of 12 Sleek, elegant look and feel that is comfortable and easy to grip, capped top stays put and ensures that this pen will never leak in your pocket