Specification Compatible Ink Cartridge WITH CHIP for Canon Pixma Ip7240 MG5440 MG6340ModelColorCapacity450Black25ML451Yellow15ML451Red15ML451Blue15ML451Grey15ML451A Black15MLInk cartridge use tips 1 After a long distance transport due to road bumps or man throw ink cartridge compartment may be with bubbles Its better to place it for some time and then install on the machine If not eager to use it is recommended to save the ink laying the outlet down For immediate use please throw down the ink outlet several times to exhaust air inside the cartridge and ensure printing smoothly 2 When Replace new ink cartridge please clean the print head before the original cartridge runs out 3 If there is disconnection or lack of color please remain the ink cartridge in the printer within 20 30 minutes 4 If the printing problem still exists please test the printhead 1 3 times until it prints smoothly according to the printer manual 5 If the printer does not recognize the ink remove the ink cartridge than reinstall it 6 If the printer still does not work you can try to restart the printer 7 Do not remove the ink cartridge from printer before it runs out 8 Turn on the printer at least once a week to prevent the printer head blocked 9 Please make the ink cartridge run out in 6 months to ensure the best printing performance Package included 1 x Ink Cartridge