Three replacement ballpoint pen refills: Jetstream and Mitsubishi. I found these while cleaning, but I don't have any pens they fit, so I'm selling them. - Ballpoint pen type: Jetstream - Ballpoint pen thickness: 0.5mm - Ink color: Black - Ballpoint pen type: MITSUBISHI - Ballpoint pen thickness: 0.7mm - Ink color: Red *Please refrain from purchasing if you are sensitive to items stored by an amateur. Instant purchase O.K. Thank you.