Compatible with: Lexmark MS810de, MS810dn, MS810dtn, MS810n, MS811dn, MS811dtn, MS811n, MS812de, MS812dn, and MS812dtn Compatible Replacements Included: 2 pack 52D1H00 black Lexmark 521H Toner Cartridges High Yield Delivers 25,000 pages just like the original Lexmark 521H compatible toner cartridge Average cartridge Page Yield* in accordance with ISO IEC 24711. *at 5% coverage (ISO/IEC standard) This is the high yield version of Lexmark compatible toner cartridge 521H