Wash with warm water and allow to air dry completely before reuse. A mild detergent can be used if necessary. Premium vacuum cleaner filters feature a 2-in-1 design: they filter dust, filter exhaust air, and protect the motor. The filter is made of highly efficient filter material that effectively filters dust, etc., preventing large dust particles from entering the motor. This ensures a long service life of the Dyson vacuum cleaner. Filters should be replaced every 4 to 6 months. If you have pets, please shorten the replacement intervals to improve dust extraction. Package includes: 2 x filters