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