CAREFULLY CHEK YOUR NUMBER to be this is the right filter for your Purifier. This filter is with for purifier models Core 400S, Core 400s-RF, Work just like come with unit. Cost-Effective : Value pack save much cost for your all year round cleaning need. Higher level filtration performance for long time using, It is recommended to replace filters for 6-12 months. Using an old filter lowers your purifier's efficiency. H13 True HEPA Technology : A higher grade true HEPA material was used with 360degrees Filtration, Captures 99% of particles to 0.3 Micrometre in diameter. your indoor quality to breath and easier, avoid sniffles and sneezing. EFFICIENT ODOR REMOVAL: Activated Carbon Filter can filtering various unfavorable odors and fume, including volatile organic compounds (VOCs), tobacco smoke, cooking smell, as as filtering pet odors to significantly reduce household odors, creating and pure for your family. Easy to install: fit for Core 400S ,no more cutting for HEPA filter. Replacement your old filter without others tool, save your time and convenient. Colour:White Material:composite material Package Contents: 1 x Purifiers Filter 1 x brush Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.