JETSTREAM Jetstream Multi-Color Multi-Function Ballpoint Pen Refills Black: 2 Blue: 2 Red: 4 Green: 1 This is a set of 9 refills. As shown in the photos. I'm selling these because I switched to a different pen. I'm selling them as a set to someone who needs them. No individual sales. These items have been handled by a person. Please refrain from purchasing if you are sensitive to this. For those who understand everything. Ball diameter: 0.5mm SXR-80-05 Mitsubishi Pencil