Introducing the 10pcs fountain pen ink refill cartridges, specifically designed for 3.4mm fountain pens. These cartridges provide a convenient and mess-free way to refill your fountain pen with high-quality ink, ensuring smooth and consistent writing. Whether you're a calligrapher, writer, or stationery enthusiast, these cartridges are a must-have for your collection, offering a practical solution for keeping your fountain pen inked up. Perfect for professionals and hobbyists alike, these ink refill cartridges cater to those who appreciate the art of handwriting and seek a reliable supply of ink for their fountain pens. With these cartridges, you can enjoy a seamless writing experience, making them an essential addition to your stationery collection.