The Caran d'Ache 8428.100 black ballpoint pen refill ensures original performance and maximum writing smoothness for your luxury pen from the prestigious Swiss brand. Made from a high-resistance metal alloy, it incorporates an exclusive oil-based ink formula that provides even pigment distribution without clumping or interrupting the stroke. Its tip guarantees an extremely smooth glide on any type of paper, considerably extending the life of your favorite writing instrument. The timeless black tone brings a touch of elegance and formality to all office tasks. It is an essential accessory for those seeking a reliable product for business meetings, document management, and daily use.