The NEW OKI Genuine Original Black Laser Toner Cartridge 45488801 is specifically designed for use with OKI B731 and B721 printers. This cartridge is genuine and original, ensuring high-quality printing performance. With a focus on laser print technology, this black toner cartridge delivers crisp and professional-looking documents and images. Perfect for those who require reliable and consistent printing results with their OKI B731 printer.