NE IMAGE&copy; - RESET FLAG GEAR for Brother TN-420, TN-450 Includes: 1 Reset Flag Gear w/Spring (No Lever Included) The printer displays a "toner life end" message if no reset gear is detected. A reset gear must be installed in any starter cartridge in order for the printer to function properly once the cartridge has been refilled and re-installed in the printer Our products are guaranteed to be great quality and satisfaction is guaranteed This product is only sold by NE IMAGE **Save Money and Go Green**