Multicolor ballpoint pen refills, featuring a fine 0.5mm line. - Brand: uni - Model Name: SXR-80-05 - Ink Colors: Black, Blue, Red, Pink - Ball Diameter: 0.5mm - Quantity: 4 pieces - Refills: Compatible The black Jetstream refill was mistakenly opened, realizing it was a Frixion after opening, but it's new and has been stored away! The gel ink was opened once, as I tried to refill my pen at home, but it didn't fit, so it's unused. Please understand that these have been stored at home. Thank you for looking.