These brown ink cartridges are made for use in all Montblanc fountain pens with the cartridge system. They are part of the limited edition Meisterstück Around the World in 80 Days collection, which is inspired by the famous adventure novel by Jules Verne. The ink cartridges come in a square packaging that evokes the concepts and themes of the collection. The packaging is made with high-quality materials and is sure to be a valuable collectible for Montblanc enthusiasts. Each package contains 8 ink cartridges, enough to write for several weeks. The ink has a rich, brown colour that is perfect for everyday writing. It is also waterproof and fade-resistant, so your writing will last for years to come.