This is a set of 3. These are replacement refills, handcrafted for Cartier ballpoint pens. Genuine refills are currently very difficult to obtain. If you are looking for Cartier refills, how about these? Compatible part number: VXRB0211. The base is a Mitsubishi SK-8 (0.8mm) black ink refill. These offer stable quality compared to overseas replacement refills. We have confirmed that they fit without any problems. Each item is carefully processed, but please understand that these are handmade products.