The TN851XLBK high capacity toner gives you up to 12,000 pages of printing.Ensure your Brother printer continues to deliver the exceptional results you've come to expect by choosing a TN851XLBK high capacity toner cartridge.Though there may be cheaper replacement alternatives available elsewhere online, only a genuine TN851XLBK high capacity toner cartridge guarantees that your machine will continue to perform as quickly and efficiently as it should.