The Lexmark Unison Original Standard Yield Toner Cartridge in Black is specifically designed for Lexmark printers, utilizing laser print technology for high-quality and crisp black prints. With its model number B341000, this toner cartridge ensures reliable performance and consistent results. The product also comes with a California Prop 65 warning regarding potential cancer and reproductive harm, emphasizing the importance of handling and usage precautions. Lexmark's commitment to quality and efficiency makes this toner cartridge a dependable choice for professionals and individuals looking for professional-grade printing solutions. Open box