Q-Connect Brother HL6050DN Toner Cartridge TN4100. LS-OB-BR21-KO. Deliver high quality results at a fraction of the usual cost with this Brother compatible Q-Connect replacement laser toner cartridge. Creating clean, crisp text and stunning vivid images, you can create professional looking documents without breaking the bank. The lightweight unit is easy to install to reduce downtime and increase productivity, allowing you to get on with producing fantastic looking printouts. This black toner cartridge yields up to 7,500 pages.