These are compatible Brother TN850 toner cartridges guaranteed to perform with Brother laser printers. It replaces the genuine (OEM) Brother TN850 toner cartridges. These toner cartridges are made with top quality components and new toner to give you the highest quality printouts every time. These compatible Brother TN850 toner cartridges are specially engineered to meet or exceed the highest standards of quality, reliability and page yields. Although these cartridges are not made or endorsed by Brother, it offers customers an economical alternative to expensive OEM Brother TN850 cartridges and comes with our satisfaction guarantee.