Oki 45488801 B721/B731 Black ORIGINAL OEM GENUINE Toner Cartridge OEM PART # 45488801 Page yield: 18,000 Pages Compatible Printer For use with: Okidata Laser Printers Oki B721dn Oki B731dn B721dn Mono Printer B731dn Mono Printer B731dn Wireless Mono Printer