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Brother TN550, TN580 Toner Reset Gear is only needed if you are refilling starter cartridges, since the starter cartridges don't always have this reset gear installed.
The printer will display a "empty toner" message if no reset gear is detected.
Starter cartridge is the cartridge that comes free with your new toner printer. If you purchase the cartridge separately, you do not need this reset gear.
Item #: 185-164-01