Specifications: The material is blended and turned acrylic with a Sea Glass mix of colors and a highly-polished finish. A sleek clip provides a clean accent for the cap and slides easily to one’s shirt pocket The Estie is also available with an engineered MV Nib Adaptor (sold separately.) The MV Adaptor delivers a vintage nib experience housed in the modern Estie. Most vintage Esterbrook nib units are compatible with this adaptor. Our nibs are specially manufactured for us in Germany by Jowo. A cushion cap closure provides a secondary seal to ensure a wet point. Ink is filled by a cartridge of ink or a converter, which acts like a syringe to draw ink from a bottle.