I own a Samsung CLX-3175FW/XXA and this is the perfect replacement for when my toner cartridges run low. There is one cyan, yellow, magenta, black cartridge in each box and they substitute exactly for what originally came with the printer. I have ordered replacements twice now from Great Offer Stock, they were the least expensive price on the internet and shipping was both times within two to three days delivered. Toner appeared fresh throughout and honestly, I have no complaints.