PLEASE NOTE: The black cartridge is not an OEMKyocera cartridge. I have used this brand and they work fine.The Kyocera Genuine TK-8317 Toner Set is a high-quality 4-pack of toner cartridges designed specifically for the Kyocera 2550ci printer model. Made in Japan, these genuine/original toners ensure crisp, clear prints with vibrant colors in cyan, yellow, magenta, and black. With a focus on laser print technology, this toner set is a reliable choice for professionals seeking consistent and professional results.