This is a set of three red 0.38mm ballpoint pen refills from MITSUBISHI PENCIL. - Model: SXR-38 - Size: 0.38mm - Brand: MITSUBISHI PENCIL - Compatible with: SXN-150 and others Thank you for looking. I am selling these because I accidentally bought the wrong ones. The packaging bag is slightly bent from storage, but there is no problem with the product itself.