OKI is a brand dedicated to creating cost effective printing solutions. OKI has products to suit small to large business needs. Your OKI printer will reward you with high quality printing and vibrant colours when you buy a genuine OKI B721 Black Toner Cartridge 45488903. Rest assured that our genuine OKI toner cartridges are authentic and can yield up to 25,000 pages. The OKI range of printers are very versatile with some model printers offering customers the opportunity to print a wide variety of professional documents, marketing materials, business cards, leaflets, banners and CD/DVD labels.