OKI 44917602 is the genuine high-capacity black toner cartridge for the OKI B431 mono LED printer and the MB491 mono multifunction printer. It is rated for approximately 12,000 pages, so busy offices that print a lot of text documents, invoices and reports can go longer between replacements. Original OKI toner is formulated for OKI's LED print engines, giving sharp black text and reliable, consistent performance throughout the life of the cartridge. It is a toner cartridge only; the image drum is a separate consumable on these printers and is replaced on its own schedule. Each pack contains one black toner cartridge. Please check that your printer is a B431 or MB491 series model before ordering, as this cartridge is designed for those machines. After comparing online prices, www.marvel.co.za should be the cheapest on this product.