Genuine toner cartridges offer the very best results, and Lexmark�s genuine toner cartridges (like the 512H ) are proof of this! Each Lexmark 51F2H00 toner cartridge comes filled with the black toner necessary to print an estimated 5,000 pages.Whether you are printing text or images, you can rely upon the original Lexmark 512H toner cartridge to delivery whenever you need it. Compatible with the Lexmark MS312dn and every other printer mentioned on this page, the 51F2H00 black toner cartridge is as versatile as it is reliable.