Sailor Kiwa-Guro pigment ink is a very special archival quality ink and it will not fade. It is also waterproof and quick-drying and suitable for all fountain pens.
These cartridges will fit most Sailor fountain pens.
Please note that the colour representation of the ink shown are scans I have done myself from the actual ink in question. The colours are quite accurate on my monitor but all monitors show slightly different colour tones so they may not be accurate for your monitor.