Kaweco Standard Converter for Fountain PensThe Kaweco converters are ideal as a cartridge replacement or their function is reminiscent of the old filling system and the use of an ink glass. By drawing up the ink, the converter is like a refillable cartridge. To refill, leave the pen in the pen and dip the nib into the ink bottle while you draw the ink. The Kaweco STANDARD converter is suitable for all larger fountain pens. * Suitable for all Kaweco fountain pens of the series: SUPRA SPECIAL