The Kaweco M brown M 6-piece fountain pen refill box offers a classic and welcoming touch with its sophisticated sepia ink. The set consists of 6 standard universal short cartridges with premium formulated brown ink that doesn't leak and offers excellent readability. They fit precisely into the body of any compact or standard-sized fountain pen. The earthy brown shade provides an irresistible vintage charm to travel notebooks, artistic sketches, and correspondence on textured paper.