Description This fountain pen ink converter is a universal writing pen converter designed to ensure a seamless and consistent ink flow for fountain pens. Its precision engineering allows effortless ink refill and quick filling action, allowing smooth writing for both personal and professional use. The plastic build promises lasting performance as a fountain pen accessory tool, elevating your writing experience. Features Inner diameter: 2.6mm -Color:Black -Material:Plastic -Size:6.50X0.70X0.70cm/2.55X0.28X0.28in -Effortless filling: the ink converter for writing pens simplifies the refilling process, allowing rapid and clean ink transfer, making your writing pens always ready for any task without messy spills -Universal compatibility: this universal writing pen converter is suitable for most fountain pens for writing, providing a flexible solution that eliminates compatibility worries and expands usage possibilities -Firm construction: made from plastic, the fountain pen ink filler is designed for longterm use and reliability, reducing the frequency of pen ink refills and replacements -Smooth ink flow: the refillable pen converter ensures precise ink flowing, improving the consistency and flow within your pen for a more satisfying and uninterrupted writing experience -Elegant design: our ink pen refills accessory boasts a sleek appearance that enhances the look of your writing pens, ideal for both business and personal use to elevate your stationery stylePackage list: 50 x fountain pen converters