The Lexmark 56F1U0E Black Ultra High Yield Corporate Toner Cartridge is designed for high-volume printing, with a yield of up to 25,000 pages. This black toner cartridge is compatible with Lexmark printers such as the MX521ade, MX522adhe, and MX521de. It utilizes laser print technology for crisp and professional-looking documents, and it is manufactured in China. This high-yield toner cartridge is an ideal choice for businesses or individuals seeking consistent and high-quality printing results.