Lexmark 501 Standard Yield Return Program Toner Cartridge (Lexmark 50F1000 Toner)Part Number: 50F1000, Lexmark 501, Lexmark 500Standard yield return program toner cartrdge.Approximately 1,500 pages.Compatible with these machines: Lexmark MS310, Lexmark MS310d, Lexmark MS310dn, Lexmark MS312, Lexmark MS312dn, Lexmark MS315, Lexmark MS315dn, Lexmark MS410, Lexmark MS410d, Lexmark MS410dn, Lexmark MS415, Lexmark MS415dn, Lexmark MS510, Lexmark MS510dn, Lexmark MS610, Lexmark MS610de, Lexmark MS610dn, Lexmark MS610dte, Lexmark MS610dtn