This set of 25 black and blue ink cartridges is perfect for fountain pen enthusiasts who are in need of professional-quality ink. The cartridges are compatible with most fountain pens and are ideal for use in both office and school settings. The Anker brand is well-known for its high-quality writing instruments, and these ink cartridges are no exception. They provide a smooth and consistent flow of ink, allowing for easy and efficient writing. These cartridges are non-personalised and come in a universal size, making them a great choice for anyone who needs a reliable and affordable writing supply.