Elevate your fountain pen writing experience with this comprehensive set of 60 ink cartridges. Each cartridge measures 2 inches in length with a precise 3.4mm bore diameter, designed to deliver smooth and consistent ink flow. The package includes six small boxes organized within a larger box containing 10 packs each, making it convenient to carry and store. These black ink cartridges feature a 0.28-inch width and are thoughtfully designed for fountain pen enthusiasts. Important note: These are non-standard size cartridges, so please verify compatibility with your specific fountain pen model before purchasing. The practical packaging arrangement allows for easy access while protecting the cartridges from damage. Each cartridge is carefully manufactured to ensure reliable performance and clean refilling. Perfect for both daily writing needs and extended writing sessions, these cartridges provide a cost-effective solution for maintaining your fountain pen's performance.