The Pilot RFJS-GP-M Refill Blue Medium is a genuine Pilot ballpoint pen refill designed for compatible Pilot retractable ballpoint pens. Filled with vibrant blue oil-based ink, it delivers smooth, consistent writing and clean, reliable lines with a medium point. Ideal for everyday writing, note-taking, document preparation, journaling, and office or school use, this genuine Pilot refill restores your pen's original writing performance while extending its lifespan.