Actually, these are the 30 ml cartridge of the type "starter", which is intended for the initial assembly of new printers. The cartridge is the same size as the standard cartridge, only 3 ml more capacity therein. Some vendors can not read well. You will send the standard cartridge with 27 ml capacity and remain 3ml guilty.
Who on quality emphasizes uncompromising, taking the original - best Lichteständigkeit, no clogged nozzles, no splashes of color.