Replacement pre-filter is only available for LG CordZero A9 series toothless vacuums The rubber ring on the filter sticks tightly to the plastic frame, completely sealing it while maintaining , so that dust will not enter the vacuum engine through filter. The vacuum filter is made of material, washable and reusable. HEPA filtration system captures and seals 100% of pollen and fine particles as small as 0.1 , such as smoke, dust, etc We recommend that you replace the filter for at least 1-3 months depending on the amount of dust collected by the vacuum cleaner. Color: Green Material: plastic+cloth Package Contents: 4 x 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.