Install a genuine OKI Black Toner Cartridge (43979102) and enjoy consistent quality prints from your OKI B410/B430/B440 laser printer, as clean and crisp as the day you bought it. After you see the Toner Low message on your OKI printer, you'll only be able to print about 100 more pages. Install a new cartridge as soon as possible when you see the Toner Empty message. This standard yield toner cartridge is packed with enough black toner to print 3,500 pages.