For fast, trouble-free toner replacement, choose a genuine Kyocera Black Laser Toner Kit (TK-580K) for your Kyocera FS-C5150DN colour laser printer. When your printer displays a Toner Low message, make sure you order a fresh toner cartridge. Keeping a spare on hand means that you can quickly replace the old cartridge when you see the Replace Toner K message. This standard yield cartridge is packed with enough black toner to print 3,500 pages.