This is a genuine Waterman rollerball pen refill, providing a smooth writing experience and vivid black ink. The F (Fine) tip is suitable for detailed writing and is compatible with existing Waterman rollerball pen models to extend the life of your pen. Due to the nature of consumables, they are easy to store when purchased in bulk, and they are manufactured to genuine specifications to ensure stable ink flow. Use dedicated refills to manage your writing environment and maintain the pen's original performance.