The Pilot RFJS-GP-F Black Fine Refill is a genuine Pilot replacement refill designed for compatible Pilot retractable ballpoint pens. Filled with rich black oil-based ink, it delivers smooth, precise writing with crisp, consistent lines through its fine point. Perfect for detailed writing, document preparation, 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.