0.5mm ballpoint pen refills, pack of 5, manufactured by Mitsubishi Pencil. - Type: Ballpoint pen refill - Size: 0.5mm - Quantity: Pack of 5 - Model: SXR-5 5P - Manufacturer: Mitsubishi Pencil Thank you for viewing. As shown in the image, I opened one, but I purchased the wrong type, so they didn't fit. I removed the pen tip, but all are new and unused. Since one has been opened and is missing its tip cover, I'm offering them at a reduced price.