These printers use the FX4 cartridge:

Canon Fax L-450

Canon Fax L-800

Canon Fax L-900

Canon L 800

Canon L 900

Canon L 2500

Canon L 2600

Canon L 8500

Canon L 9000

Canon L 9000 MS

Canon L 9000 S

Canon L 9500

Canon L 9500 MS

Canon L 9500 S

Canon Laser CLass 8500

Canon Laser Class 9000

Canon Laser Class 9000 MS

Canon Laser Class 9000 S

Canon Laser CLass 9000 S/MS-MFP

Canon Laser CLass 9500

Canon Laser Class 9500 MS

Canon Laser CLass 9500 S/MS-MFP

Canon Laser Class 9800