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Reset gear for use in Brother TN350 toner cartridges.
This gear is only needed if you are refilling STARTER* cartridges for the Brother TN350 TN550 TN580, since the starter cartridges don't always have this reset gear installed. The printer displays a "toner life end" message if no reset gear is detected. A reset gear must be installed on any used TN350 TN550 TN580 starter cartridge in order for the printer to function properly once the cartridge has been refilled and re-installed in the printer.
* A starter cartridge is the cartridge that ships free with your printer. If you purchase the cartridge separately, you will not require this gear.
Each kit contains : 1 reset gear + instructions for assembly (easy to do! )