2 Pack New Compatible Canon X25 Toner Cartridge-Black For Canon ImageCLASS models MF3240, MF5770, MF5750, and MF5730 Provides clean, sharp text and smooth grayscale printing Page Yield: 2,500 per cartridge | Shelf Life: 24-36 months per cartridge If your printer is "Not Recognizing" the toner: Verify you have the correct cartridge for your specific printer model---Ensure that the cartridge is fully inserted into the printer and is installed correctly Package includes 1 black toner cartridge in each box---Total of 2 boxes