The Lexmark Unison 56F1H0E High Yield Black Laser Toner Cartridge is designed for use with Lexmark printers, specifically the MS321, MS421, MS521, MS621, and MS622 models. This high-yield toner cartridge ensures long-lasting, crisp black prints with a green tint for added visibility. With a manufacturer warranty of 1 year, customers can trust in the quality and reliability of this Lexmark product. Easy to install and providing consistent, professional results, this toner cartridge is an essential component for any Lexmark printer.