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