Thank you for viewing. These are replacement ink cartridges for Parker-type oil-based ballpoint pens. They are unbranded compatible products and not genuine. In the case of a click-action Jotter, there was a slight issue where the tip protruded slightly even when retracted. There are no issues with twist-action pens. In addition to Parker-type, we also carry Cross-type and Montblanc-type replacement ink cartridges. For Montblanc-type, we have oil-based as well as water-based rollerball options. Ink colors are black and blue. Red is also available for Cross and Parker types. Combinations are also possible, so please feel free to inquire in the comment section.