The Schneider Office 765 M black ballpoint pen refill in X20 metal format offers a fluid, long-lasting, and highly reliable writing experience for everyday use. Manufactured by the prestigious German brand, it features oil-based black ink with ISO 12757-2 indelible certification, guaranteeing clean, resistant lines that won't fade over time. With a medium line width (M) and high-precision metal tip, it glides smoothly across the page without clumping or flow failure. This refill is perfectly compatible with Schneider K 15, Office, Fave, and other X20 format pens. It's the perfect solution for offices, official archives, and school tasks that require clean documents, formal signatures, and continuous, uninterrupted performance.