Compatible Replacements Included: (6) pack black toner cartridges fit for - HP LaserJet Enterprise M4555f M4555fskm M4555h M601n M601dn M602n M602dn M602x M603n M603dn M603xh Compatible Printers: HP LaserJet Enterprise M4555f M4555fskm M4555h M601n M601dn M602n M602dn M602x M603n M603dn M603xh Print the same number of pages as the original HP90A Black Page Yield*: 10,000 Average cartridge Page Yield* in accordance with ISO-19752. *at 5% coverage (ISO/IEC standard) This is the standard yield version of HP compatible toner cartridge HP90A Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.