The pack you see here contains one each of our remanufactured Samsung CLT-K506L, CLT-C506L, CLT-M506L and CLT-Y506L. Thus giving you all four toner cartridges necessary to operate your printer.These remanufactured cartridges have been produced using as many parts from the original Samsung CLT-506L/ELS toners as possible. These components have been individually examined and cleaned to ensure the best quality print possible from this recycled CLT-506L Samsung compatible toner cartridges. If any parts are not replaceable our manufacturers substitute them for high quality patent free compatible CLT-506L parts.As refilled high capacity cartridges compatible with many printers including the Samsung CLP-680ND and offer the same 3,500-6,000 page duty cycle.Like all of our remanufactured toners our Samsung compatible CLT-506L/ELS toner cartridges come fully guaranteed and can be delivered free of charge within the UK.