The Hugo Boss blue M rollerball refill (2 units) offers the smooth, fluid feel of a fountain pen combined with the practical convenience of a ballpoint pen. Specifically designed for Hugo Boss rollerball pens, this two-unit blue refill set delivers a rich, continuous, and quick-drying medium line. The precision tip ensures a frictionless glide on paper. It's the perfect choice for those who write for extended periods and demand maximum comfort and the classic blue tone in their corporate documents.