Pilot Single Spare Ink, black, 24 pieces (2 boxes of 12). These are from several decades ago, and the ink is about half full, so it has probably evaporated. Therefore, they are offered at a low price. I don't have a fountain pen, so I haven't checked the condition of the ink. Please be aware of this. They will be shipped in an envelope. These are old items. Please refrain from purchasing if you are sensitive to such things.