Our ink converter designed to fit a variety of fountain pens with 3.4mm and 2.6mm diameters, making it a versatile tool writing enthusiast. This refillable ink converter allows you to easily switch between different ink bottles, ensuring a smooth and consistent writing experience. Whether you're using a classic writing tool or a modern retractable fountain pen, this converter is an essential accessory for maintaining your pen's performance. Features -Color:Multi -Material:Stainless steel and plastic -Size:12.00X0.70X0.70cm/4.72X0.28X0.28in -Quantity: sufficient quantity to meet your daily work and study needs, and you can also share with your family and friends. -Durability: made of stainless steel and plastic, these converters are sturdy, , and easy to clean, ensuring longterm use. -Compatibility: they have a wide range of compatibility, suitable for most types of pens, meeting the needs of most pens with ink converters. -Design: featuring a vacuum spring design, they make ink filling easier and can be easily disassembled, cleaned, and installed. -Safety: prevents ink absorption by hand, making the process less complicated. the product is and includes pointed items, so keep away from children Package list: 9 x fountain pen converters