By installing a genuine OKI Black Toner Cartridge you can enjoy fantastic quality prints and reliable operation from your OKI C610 printer. When the current toner cartridge in your C610 is running out, you'll see a Toner Low message or notice faded text on printouts. Order a replacement quickly and replace the old one when you see Toner Empty displayed. This standard yield toner cartridge is packed with enough black toner to print 8000 pages.