This is a set of 3 water purifier cartridges and 2 sets of replacement parts. The cartridges are unused, but one set of the replacement parts (B set) has been used. These were used with MD201 and MD301 models. The boxes of the main units that were used are shown in images 6 and later, but the boxes and main units themselves are not included. I'm not sure which of the 3 cartridges were for MD201 and which were for MD301, but they were interchangeable. One of the 3 cartridges has a "Super High Grade" logo, while the other two do not. - Set Contents: 3 water purifier cartridges, 2 sets of replacement parts - Color: White - Condition: Unused, unopened package Thank you for looking.