General description For crisp colour output and unbeatable reliability from your OKI C301 or C321 laser printer, install a genuine OKI Yellow High Yield Toner Cartridge (44973533). This standard yield toner cartridge is packed with enough yellow toner to print 1,500 pages. Usage Order a replacement yellow toner cartridge when you see a 'Y Toner Low' error message. Swap it for the empty cartridge when 'Toner Empty' is displayed and continue printing straight away.