Lexmark C540H1KG High-Yield Toner: * OEM toner cartridge for Lexmark C540n, C543dn, C544dn, C544dtn, C544dw, C544n, C546dtn, X543dn, X544dn, X544dtn, X544dw, X544n, X546dtn * Consistent, professional results * Designed to work flawlessly for clear and sharp results * Installation is intuitive and simple