What is/are in the package? 12 Packs (3 x LC109 Black + 3 x LC105 Cyan + 3 x LC105 Yellow + 3 x LC105 Magenta) How many pages does this print up to? Yields up to 2,400 pages @ 5% coverage on Letter/A4 or depends on usage How do you install the toner cartridge? ?Pull out the plastic tag which is on the side of the cartridge, if applicable ?Insert into the printer ?Enjoy printing! What are the compatible printers? Brother Laser Printer MFC-J6520DW J6720DW J6920DW What is the warranty? Green Toner Supply offers 1-Year money back warranty on defective toner cartridges What is the shelf life? Suggested shelf life: Up to 36 months 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.