PERFECTLY COMPATIBLE WITH: Exclusively designed for Core 400S True HEPA Air Purifier to maintain its optimal performance. Please check your purifier model number carefully that can be find on the device to ensure this is the correct core 400S-RF replacement filter.DEEP HYPERFINE PUNIFICATION OF AIR: Ultra-Fine Nylon Pre-Filter, H13 True HEPA Filter by upgraded HEPASmart technology and the barrel type 360 filtration & intercepts the suspended solids in the air, effectively filter 0.3 Micrometre and above particles and tiny dust, such as dust, lint, fibers, pollen, dander, common pollutants of air and so on, the purification rate is more than 99.97%.EFFICIENT ODOR REMOVAL: Activated Carbon Filter can filtering various unfavorable odors and fume, including volatile organic compounds (VOCs), tobacco smoke, cooking smell, as well as filtering pet odors to significantly reduce household odors, creating fresh and pure air 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.Cost-Effective Price: Value pack save much cost for your all year round air cleaning need. Higher level filtration performance for long time using, It is recommended to replace filters for every 6-12 months. Using an old filter lowers your air purifier's efficiency.colour: whiteMaterial: composite materialPackage Contents:2 x Air Purifiers FiltersOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.