Jetstream 0.5 Multi-Color/Multi-Function SXR200-05 [6 pieces] 980 Shaft diameter: 2.3mm Length: 67mm Oil-based ballpoint pen refill. This is a 0.5mm refill ink for the Jetstream Prime multi-color/multi-function pen, recommended as a gift. Jetstream is significantly different from conventional oil-based ballpoint pens, offering a smooth writing feel and quick-drying properties, allowing you to draw clear, dark lines smoothly and effortlessly. Refill Jetstream Prime 0.5 Multi-Color/Multi-Function 5 pieces SXR20005.24 Please let us know if you would like to change the color.