PERFECT FIT - They are specially designed for Dyson V7 Animal, V7, V8 Absolute vacuum cleaners. The post filter is only suitable for Dyson V7 and V8 vacuum cleaners. Not for use with V6 vacuum cleaners. Please confirm the model and size of your accessories before purchasing Please refer to the product image for details. Compare 965661-01 Pre-Filter and 967478-01 Post-Filter. Value Pack - Includes 3 Post Filters, 3 Pre Filters and 1 Brush. HIGH EFFICIENCY FILTER TECHNOLOGY - High-efficiency high-end pre-filter and post-filter to ensure your vacuum cleaner works properly and optimally, it is recommended to replace the filter every 2-3 months or according to usage. Your Needs - If you have any questions, please feel free to contact us. Contact us, we promise; provide the highest quality products; and provide efficient customer service.