Feature: Made of high strength and environmental protection material pre and post filters, excellent to reduce the infiltration of dust, pollen and other allergens in the air you breathe, better for your health Replacement filters are durable and work efficiently in your vacuum Easy to install: to be able to clean it again as soon as possible, simply remove the old filter and put it back in its place Having some additional filters at hand, it is possible to replace a clean set for dison vacuum at a time when the old filter is dirty Washable and reusable filter, for optimal performance, it is recommended to wash the filter once a month and replace the filter every 3 months. Filter cleaning can help you keep for Dyson cordless for as long as possible. Package List: 1/2 x Filters