Experience smooth, expressive writing with the Uni-Ball Air, a unique rollerball pen featuring a special tip designed for less friction. Its smartly designed barrel and translucent grip taper to a unique acetal plastic surround for the metal ball, allowing for greater ink flow and varied line widths. With light pressure, achieve finer strokes, and with increased pressure, enjoy thicker, darker, wetter lines similar to a fountain pen. While the ink may take slightly longer to dry for the thickest lines, it offers dense, fraud-resistant Super Ink that is highly permanent. The Uni-ball Air quotes a line width of 0.35mm - 0.55mm, but can produce lines up to 1mm wide with extra pressure. The liquid ink ensures comfortable, scratch-free writing.