Renewable Toner Compatible Toner Cartridge Replacement for HP 51A Q7551A  ( Black , 1 pk ) Lifetime Warranty. We always honor our warranty, even if the Amazon return window has closed. Contact us directly with any questions or issues. RT MICR Cartridge with magnetic toner for check printing. OEM #: HP 51A / Q7551A | High Yield: 13,000 Pages; prints 39k checks @ 3 per page For use in HP LaserJet Enterprise Printers: P3005 / P3005d / P3005n / P3005dn / P3005x / M3027 / M3027x / M3035 / M3035xs MFP RT is the manufacturer of this MICR toner cartridge. The listing of any RT product is not intended to imply any endorsement or direct affiliation with the OEM trademark owner.