Features: Experience seamless writing with our 2.6mm/3.4mm Bore Diameter Rotating Fountain Pen Ink Converter, fit on various fountain pen, retractable inks pen, press fountain pen, retractable fountain pen. Crafted from ABS and metal, this refillable twist action ink converter features rotating knot that ensures easy and quick inks refills while preventing leaks. Suitable for students, teacher, office workers, business professional, artist, and fountain pen enthusiasts who demand convenienct replaceable fountain pen inks converter for daily writing and signing tasks. Widely used for schools, offices, meeting, lecture report, and homeschooling, allowing you to effortlessly refill your fountain pen, ensuring uninterrupted writing experience. Enhancing your writing experience with this fountain pen ink piston converter, must have accessory for maintaining the durability and functionality of your favorite fountain pen, calligraphy ink pen. Specifications: Color: Black Type: 2.6mm, 3.4mm Component: ABS; Metal Size: Approx. 73mm/2.87in Weight: Approx. 2g Package Includes: 1Piece Rotating Fountain Pen Inks Converter note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color