The Twsbi Traditional Piston Converter is the perfect spare converter explicitly designed for the Twsbi Swipe fountain pen. This high-quality converter features a traditional twist mechanism, allowing for smooth and reliable ink filling.While it boasts a standard international size opening, please note that the overall diameter is too large to fit other pens compatible with standard International cartridges and converters.Standard International top hole fitting for easy compatibility for the Swipe holds more ink than the typical converter, ensuring longer writing sessions without frequent refills.Specifically designed to fit the Twsbi Swipe fountain pen, providing an ideal solution for ink lovers. Traditional twist converter mechanism for effortless operation and reliability.Elevate your writing experience with the Twsbi Traditional Piston Converter, the perfect companion for your Swipe fountain pen. Enjoy the convenience of a spare converter and indulge in your favourite inks!