The calligraphy nib unit is available in line widths of 1.1 mm, 1.5 mm, 1.9 mm and 2.3 mm. There is also a TWIN feather that pulls two dashes at once. The calligraphy nib unit is made of bright spring steel in Germany.
All Kaweco fountain pen spare nib units are made exclusively in Germany
Note: This spring fits all fountain pens of the following Kaweco series: AL Sport, AC Sport, Liliput, Student, and Dia2.