The Greencycle CF289X Toner Cartridge is a compatible black toner designed for HP printers such as the M507N, M507DN, and M507X models. It is also compatible with HP LaserJet Enterprise Flow MFP M528C and M528Z, as well as HP LaserJet Enterprise MFP M528DN and M528F. This unit is a single pack and does not come with a chip, making it a cost-effective option for those looking for high-quality printing supplies. Made in China by the brand GREENCYCLE, this toner cartridge ensures reliable and professional printing results.