Containing many compatible and recycled parts, our remanufactured Lexmark 78C20K0 is a great alternative to purchasing a genuine Return Program cartridge. This remanufactured Lexmark 78C20K0 unit offers the same 2,000 estimated pages and the toner powder within has been designed to offer comparable print quality too!As ease of use is especially important to our manufacturers, this version of the 78C20K0 is compatible with all the same printer, including the Lexmark CS421dn.  We offer a 100% satisfaction guarantee with this replacement for the Lexmark 78C20K0 and all of our top quality remanufactured products.