Do it Wiser Compatible Toner Kyocera TK-3122 for Kyocera Ecosys FS-4200DN M3550idn 1T02L10US0 (Black) &#9989; Estimated page yield: Black 21,000 pages, at 5% coverage (depends on printer and usage) &#9989; Compatible with part number: Kyocera TK-3122 1T02L10US0 &#9989; Compatible printer models: Kyocera ECOSYS FS-4200DN, Kyocera ECOSYS M3550idn &#9989; Our Do it Wiser Smart toner cartridges are covered by a 1 year warranty against defects &#9989; Cartridges certified to work | ISO 9001 quality assurance | ISO 14001 environmental management | RoHS Lead Free 1 Black cartridge 21,000 pages Kyocera ECOSYS FS-4200DN Kyocera ECOSYS M3550idn