About this item 16 Pack Black Rollerball PensThese black pens use water-based quick-drying ink, It does not fade, the ball point pen black ink can dry quickly in a short time, not smudge hands and no blots ,keeping the paper tidy. Prevent Broken Ink and Ink LeakageThe black gel pens with built-in precision ink output regulator, upper dense and the lower sparse multi-layer fin structure can adjust the pressure inside the rollerball pens to make the ink output stable. Even if it is accidentally dropped during the writing process, the ink will not be broken. Tungsten carbide ball 0.5mm Fine NibThese black pen 0.5mm rollerball pen tip is made of tungsten carbide balls, High hardness, Smooth writing, stable and durable. Writing on paper will not be scratchy, and the color of the writing stitches is uniform, clear and not blurred. Large Capacity Ink Storage BinThe ink pen uses a straight liquid flowing ink system, large capacity and long writing, writing length is greater than 1500 meters, which is 3 times that of ordinary writing pens. Avoid the trouble of frequently changing the refill. It can meet the needs of your daily study and office for a long time. Variety UsesThis black ink pens is suitable for office meeting records, signatures, and document signing are also very suitable for making important notes, sketching and drawing in class. It is a must-have item for schools, homes and offices.