This is a set of 8 blue 0.5mm Jetstream ballpoint pen refills. - Model: SXR-80-05 - Color: Blue - Size: 0.5mm I purchased a set of 10 from Amazon two years ago, but I stopped using the corresponding ballpoint pen, so these are left over. I'm selling them as part of a decluttering effort. I hope someone who owns the corresponding ballpoint pen will find these useful. I confirmed with Chat GPT that the refills from two years ago should still be usable if they are oil-based and unopened. Instant purchase welcome ⭕️ Price negotiation ✖️ Thank you for looking.