The refill is suitable for most , suitable for school, home, office use, etc. It can be used for sharing with friends or family. Note: Neutral ink is easy to volatile. If it is not used for a long time, the refill should be covered with a pen sleeve. Ink refills, used for replaceable ballpoint pens, are available in sufficient quantities to meet their daily needs. The high-quality stainless steel nib makes writing and not easy to break the ink. Good quality and long service life.