[Compatibility] Compatible with levoit air purifier replacement filter, Model core 300 air purifier replacement filter. [Nano filtration technology] Core 300 replacement filter used 4 layers of filtration and adds a nano fiber filter layer, which has a stronger filtration effect on ultrafine particles below 0.1um .[More Durable and Stable Filtering Effect] Stable filtering effect and service life of 6 to 8 months. [Filter] captures large particles such as hair, animal fur and lint. [H13 True HEPA Filter] filters 99.97% of fine particles in the air. Color: As Shown Material: Plastic Package Contents: 1 x Filter Items Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.