Linkyo replacement Brother TN-850, Brother TN-820, and DR-820 toner cartridges are compatible with the Brother HL-L6400DWT printer. Linkyo replacement for Brother TN-850 toner cartridge is a high-yield version of TN-820 toner cartridge with an estimated yield of 8,000 pages (based on 5% coverage). It achieves greater print quality by maximizing printer performance. Linkyo Replacement Brother TN-820 provides a sharp monochrome (black) text with a standard yield of 3,000 pages.