Without Chips, Two Compatible High Yield Toner Cartridges For CF289X Each Deliver 10, 000 Pages for HP LaserJet Enterprise M507x M507n M507dn and MFP M528dn M528f / Follow MFP M528c & M528zThese cartridges are NOT equipped with Chips. Switch the chip from the depleted cartridge guided by the included instructions using the included screwdriver. Ensure that the Chip is inserted into the correct direction pushing it with the end of the screwdriver into the correct position in the slot.