SOONVIEW Compatible for Lexmark 51B1000 black toner cartridge. Compatible for Lexmark MS417dn MS517dn MS617dn MX417de MX517de MX617de Printers. 8,500 pages per 51B1000 black toner at 5% coverage on letter/a4. SOONVIEW 12 months warranty have established a professional, trustworthy and friendly team. If you ever have any questions or experience any issues with your item, our team will be happy to assist you quickly.