Product description: PFKink is a mature professional inkjet and toner brand that provides high-quality and low-cost remanufactured ink cartridges to homes, offices, small businesses, large enterprises and organizations around the world. Each PFKink 240ink cartridge is renovated by the factory through 12 stringent processes, which ensures that its quality is almost the same as that of OEM ink cartridges.Compatibility printer.Canon PIXMA series.Pixma mg2120 2140 2220 3120 3122 3140 3220 3222 3500 3520 3522 3620 4150 4140 4220.Pixma mx372 392 432 434 439 452 459 470 472 479 512 522 532.PIXMA TS5120.Guiding steps.1. Please remove the protective clip at the bottom of the ink cartridge before installation.two?. After removing the clip, check whether there is a protective film on the head of the ink cartridge, usually a small strip of purple plastic, and gently remove it from the print head.3. 3. Place the ink cartridge in the correct slot of the printer. For more information about replacing ink cartridges, please refer to the instructions that came with the printer.Matters needing attention.1. Be sure to confirm your printer model before placing an order.2. 2. Before installing these ink cartridges, remove the lid and pull off the plastic tape. (don't touch the chip).3. Does the printer screen pop up "non-original ink cartridges"? Click 'OK',' and they will continue to run.4. They have an error message 'REPLACE CARTRIDGES' or' LOW INK'? Please wipe the copper contacts (chips) with a pencil eraser or reinstall them several times