These printers use the PFI-106MBK cartridge:
Click On a Printer to View it's Cartridges
Canon imagePROGRAF iPF 6350
Canon imagePROGRAF iPF 6400
Canon imagePROGRAF iPF 6400 S
Canon imagePROGRAF iPF 6400 SE
Canon imagePROGRAF iPF 6450