10 refills, Uni-Ball Jetstream SXR-80-05 0.5mm Refills for Jetstream Multi pen | eBay
Amazon.com : Uni Jetstream slim & conpact 0.5mm Ballpoint pen 3colors with Gel Ink Refill (Black,Blue,Red) Japanese Stationery Original Packaged (Black) : Office Products
Uni Jetstream SXR-ML-05 Ballpoint Multi Pen Refill - 0.5 mm - Black | JetPens
Japan Uni Jetstream SXR-80 0.5mm Multi Ball Pen Refill - Blue | Kawaii Limited