Pre-motor HEPA filter for Dyson Big Ball CY18 CY22 CY23 CY24 CY25 CY26 CY27 CY28 DY75 DY77 DY78 vacuum cleaner. The filter is made of high-efficiency filter material, which can effectively filter dust to prevent large dust particles from entering the motor and ensure a long service life of the vacuum cleaner. Premium vacuum filters adopt a two-inch design with high efficiency to block fine particles, floating dust, etc. Wash with warm water and allow to air dry completely before reuse. A mild detergent can be used if desired. To ensure proper and optimal performance of your vacuum cleaner, we recommend replacing the filter every 4 to 6 months. Package includes: 3 * Pre-motor filters.