The 4PK TN850 Toner Cartridge is a high-quality compatible product specifically designed for Brother printers. With a print technology of laser, this black toner cartridge is compatible with various Brother printer models including the MFC-L5800DW, MFC-L5850DW, and MFC-L5900DW. It has a page output of 8,000 pages at 5% coverage, making it ideal for long and uninterrupted printing sessions. This product is a reliable and cost-effective solution for producing professional-quality documents and images.