NE IMAGE&copy; - RESET FLAG GEAR & LEVER for Brother TN-420, TN-450 Refill Includes: 1 Reset Flag Gear & Lever (3pcs) 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**