General description The 3Pcs Replacement Pre-Filter is designed specifically for Dyson Big Ball vacuum cleaners, including models CY18, CY22, CY23, CY24, CY25, CY26, CY27, CY28, DY75, DY77, DY78. This pre-motor HEPA filter effectively captures dust and prevents large particles from entering the motor, ensuring a longer service life for your vacuum cleaner. Technical specifications Type: Pre-motor HEPA filter Material: High-efficiency filter material Design: Two-inch design for high efficiency Usage Wash with warm water and allow to air dry completely before reuse. A mild detergent can be used if desired. Recommended replacement every 4 to 6 months for optimal performance. Other information Package includes: 3 * Pre-motor filters.