What is/are in the package? 2-Pack CF287X 87X 287X Laser Printer Toner Cartridge How many pages do these print up to? Each prints up to 18,000 pages based on 5% coverage (Standard Yield) How do you install the toner cartridge? ?Remove the orange cover ?Pull out the plastic tag (where you see the orange ring) which is on the side of the cartridge, if applicable ?Insert into the printer ?Enjoy printing! What are the compatible printers? HP Laser Jet Enterprise M506 M506n M506x M506dn MFP M527 series m527c HP Laser Jet Pro M501n M501dn Printer GTS offers money back warranty on defective toner cartridges Please store the unused/unopened toner cartridges in a dry and cool place. Avoid sun exposure Have a question or a problem? Please do not hesitate to contact us, our Customer Services Team will usually response your email or message within 1-2 business days.