These printers use the PFI-207BK cartridge:
Canon imagePROGRAF iPF 680
Canon imagePROGRAF iPF 685
Canon imagePROGRAF iPF 780
Canon imagePROGRAF iPF 780 MFP M40
Canon imagePROGRAF iPF 785
Canon imagePROGRAF iPF 785 MFP M40