The OKI 45439001 Black Toner Cartridge is a genuine product manufactured by OKI specifically for use in OKI Data printers. This compatible toner cartridge is designed for laser print technology, producing high-quality black prints. It is compatible with the OKI B731dn model, ensuring a perfect fit and optimal performance for your printer. Trust in the OKI brand to provide reliable printing supplies that meet your printing needs with precision and efficiency.