Aletik Compatible Ink Cartridges PGI-250XL CLI-251XL Ink Replacement for 250 Ink 251 Ink Use for Pixma MG5420 MG5520 MG5620 MG6620 MG6320 MG6420 MG7120 MG7520 MX722 MX922 iX6820 iP7220 iP8720How to use: (1)Please tear off the plastic tape gently; (2)Remove the orange protective cover carefully before installing the ink tank; (3)Push the cartridge forward in to the ink slot until it snaps into the correct place. Tips: (1)Please use the compatible printer which use this ink only. Do not use a printer which has been used with regular ink, it is harmful to mix the different kinds of ink together. (2)Not recognized: Please take out the cartridge, and it is recommended to clean the chip with an eraser, then try to reinstall the cartridges for several times. (3)The ink cartridges may leak for uncontrollable factors during the transportation.