[Full Compatibility] for Core 300 and Core 300s Air Purifier, part# Core 300-RF, Core 300-RF-TX. NOTE:Any use of the name or model designation for this product is made solely for purposes of demonstrating compatibility. [3-IN-1 Filtration] 3-in-1 HEPA and Activated Carbon Filtration System (①Nylon Preliminary Filter ②H13 Grade True HEPA Filter ③Activated Carbon Filter with ARC Formula) to take out 99.97% of substance down to 0.03 Micrometres in size, automatically improving air quality and promoting better health and well-being . [Effortless Setup] Easy to replace and disposable, no tools required. Just take the old filter out, and fit the new one in. [Package includes] 3 x Core 300-RF-TX Replacement Filter. Size: 7.56 x 7.56 x 5.75 inches. [Replace Regularly] To maintain its performance, we recommend you to replace core 300/ Core 300S air purifier replacement filter every 6-8 months which depends on your usage. Product Name:Air Purifier Filter Applicable Model:for Core 300 and Core 300s Product Features:Filter dust, pollen, hair, PM2.5, remove odor Colour:C:Yellow Material:ABS Size:19.2x19.2x15cm Package Contents: 3 * Air purifier filter Only the above package content, other products are not included. Note: Light reflection 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.