Genuine OEM Kyocera FS-C5100DN Toners
The FS-C5100DN uses the TK-542 toner family, with a different suffix for each color: K for black, C for cyan, M for magenta, and Y for yellow. That final letter is the quickest way to separate the four choices.
Toner Buzz carries genuine Kyocera TK-542K, TK-542C, TK-542M, and TK-542Y cartridges. Check both the TK-542 family number and the color suffix before ordering the toner named by the printer.