REMANUFACTURED IN CANADA Lexmark 20K (20000 PAGES) ULTRA HIGH Yield Toner Cartridge NOT MADE BY LEXMARK ALSO CALLED 501U 50F1U00 PAGE YIELD: 20,000 PAGES @ 5% COVERAGE For Lexmark Models: MS610DE MS610DN MS510DN MS610DTN MS610DTE Lexmark MS610de Lexmark MS610dn Lexmark MS510dn Lexmark MS610dtn Lexmark MS610dte MS610de