Our standard pearl black converter with chrome elements fits into all our long fountain pens. Instead of two ink cartridges, the converter is inserted into the barrel of the fountain pen. This makes it easy to refill ink from the ink glass. Multiple filling in a row increases the filling quantity. A major advantage of converters is the sustainability aspect: unlike conventional ink cartridges that end up in the waste after the ink is used, it can be reused permanently and refilled again and again. It goes particularly well with our Kaweco ink in pearl black.