The Lexmark 56F1U00 Unison Original Ultra High Yield Laser Toner BLACK Cartridge 25K is a high-quality laser toner cartridge designed specifically for Lexmark printers. With a sleek black color and a print technology of laser, this cartridge ensures crisp and professional-quality prints. The ultra high yield capacity of 25,000 pages makes it ideal for businesses or individuals who require a large volume of printing. This genuine Lexmark product is compatible with the Lexmark 56F1U00 model, guaranteeing reliable and consistent performance.