The Kaweco mini converter was designed for use in the Kaweco Classic Sport, Skyline Sport and Ice Sport fountain pens, to allow you to use bottled in your fountain pens. The Kaweco mini converter uses a push mechanism for filling. This also fits many other international pens where a short converter is needed! The mini converter does not fit well in the metal Kaweco pens such as the AL-Sport, the Brass Sport or the Liliput.