Nakaya Naka-ai Writer Ballpen Matte Black ChromeNakaya achieves its modern matte black finish by applying a thin layer of clear urushi lacquer over ebonite hard rubber. This creates a soft, subdued surface, adding a unique element to the Nakaya Naka ai Writer Ballpen. Both Parker rollerball style gel refills and Parker QuinkFlow oil based ballpoint style refills are available. Any Nakaya ebonite hard rubber pen (this includes all Nakaya pens with the exception of the Celluloid, Briarwood, Carbon