The Waterman black M ballpoint pen refill, ref. S0944480, guarantees extremely fluid, consistent, and flawless writing for your luxury pen. Filled with advanced formula oil-based black ink, it provides clean, quick-drying lines on any type of paper. Its medium (M) stainless steel tip glides smoothly without scratching, offering the ideal balance between definition and writing comfort. It is compatible with the entire Waterman ballpoint pen line. Indispensable for executives and connoisseurs of fine writing instruments who demand the highest quality in official documents.