Rhinotek FX-4 is the OEM compatible fax toner/drum cartridge. Heavy duty toner offers over 12% more pages of crisp images than the OEM at average use (5% coverage) and medium density (3). This cartridge is designed for the following Canon systems: FX-4; LASER CLASS 8500; LASER CLASS 9000; LASER CLASS 9000F; LASER CLASS 9000S; LASER CLASS 9500; LASER CLASS 9800; LASERCLASS 8500; LASERCLASS 9000; LASERCLASS 9500; LASERCLASS 9800. For a complete compatibility list please refer to the original manufacturer's web site.