Page Yield*: 2500 pages Compatible with Lexmark 601 Lexmark-601 Lexmark 601XL Lexmark-601XL Laser black (per cartridge) *at 5% coverage (ISO/IEC standard) Package Contents: 4 x Lexmark 601XL black compatible toner cartridges Lexmark 601 Lexmark-601 Lexmark 601XL Lexmark-601XL Compatible with: Lexmark MX printers: MX310dn, MX410de, MX510de, MX511de, MX511dhe, MX511dte, MX610de, MX611de, MX611dhe, and MX611dte SPEEDYIINKS: Lexmark 601XL black toner cartridge pack compatible replacement for Lexmark 601 Lexmark-601 Lexmark 601XL Lexmark-601XL Professional compatible replacements by SPEEDYIINKS. Lexmark is a registered trademark of Lexmark and is not affiliated with and does not endorse SPEEDYIINKS.