This is a staple of office supplies. Extra fine and medium nib can be used on a single coaxial coax Replaceable pen core (bold line) and ink cartridges. With one ink tank, you can use only one of the two nibs for frequent use. It uses a permanent pen and specially formulated ink that reduces the unpleasant smell of your nose. Ensures ink quality with a single writing that is strong enough to recognize even the finest letters. They are also used for writing or illustrations on jars, glass, vinyl and more. Because it is oil-based, it can also be used for acrylic, plastic bottle art, and plastics baked art. The tip is also attractive because it has less breakage, fraying, and crushing. It is widely used in childrens craft scenes such as school crafts.