Package Inclusions: 4 pack 52D1H00 521H Lexmark Toner Black Cartridges High Yield Compatible Printers: Lexmark 521h is used in MS710dn MS710n MS711dn MS810de MS810dn MS810dtn MS810n Lexmark MS810 Toner MS810DN toner Compatible Printers: 521H Toner is used in MS811dn MS811dtn MS811n MS812dek MS812dn Lexmark Toner MS810 Delivers 25,000 pages just like the original Lexmark 521H toner MS711DN toner cartridge Average cartridge page yield in accordance with ISO IEC 24711 Reliable printing Quality: LD Products 521h Lexmark Toner cartridge replacements have excellent printing performance, both pictures and text will be very clear, vibrant and vivid.