Renewable Toner Modified MICR Toner Cartridge High Yield Replacement 90X CE390X for HP LaserJet Enterprise M4555 MFP 600 M602 M603 PRINT PROFESSIONAL CHECKS with this genuine 90X cartridge refilled with RT magnetic toner. Developed to ensure proper bank acceptance with each CE390X MICR cartridge SUPERIOR QUALITY. Manufactured by expert RT technicians with our superior blend of magnetic toner, using a genuine 90X toner cartridge. The listing of any RT product is not intended to imply any endorsement or direct affiliation with the OEM trademark owner. OEM #: HP 90X / HP CE390X | Yield 24k standard page; prints 72k checks @ 3 per page For use in HP LaserJet Enterprise Printers: M4555, M4555f, M4555fskm, M4555h; 600 M602dn, M602n, M602x, M603dn, M603n, M603xh MFP LIFETIME WARRANTY: we always honor warranty, even if the Amazon return window has closed