Renewable Toner Compatible Toner Cartridge Replacement for HP 645A C9733A C9732A C9730A C9731A Laserjet Pro 5500 5550 (Cyan, Magenta, Yellow, Black, 4-Pack) LOW COST, HIGH VALUE. RT replacement for HP 645A toner set. Printing cost is as low as .005 cents per page, up to 60% less than HP 645A original toner cartridges. QTY: 4 Color: CMYK | Replaces OEM #: HP 645A / HP C9733A HP C9732A HP C9730A HP C9731A Black Yield: 13,000 standard pages based on 5% coverage; CMY Yield: 12,000 pages For Use In: HP LaserJet Pro 5500 5500n 5500dn 5500dtn 5500hdn 5550 5550n 5550dn 5550dtn 5550hdn LIFETIME WARRANTY: we always honor our warranty, even if the Amazon return window has closed