I accidentally bought the wrong type. These are ballpoint pen refills. I'm selling them as a set of 4 packs. Individual sales are not possible. Thank you for your understanding. All are new and unused, but one black 0.38mm refill has been removed. Please check the product numbers in the photos. I just bought these today (2023/4/22). Returns and exchanges are not accepted after purchase. Thank you for your understanding. Type of writing instrument: Ballpoint pen Pen features/materials: Oil-based ink, knock type, refills Ink color: 2 colors (red and black) If you use ballpoint pens frequently, how about these? Please consider purchasing them.