1. The innovative brush reaches deep into corners and edges to remove more dirt， dust and debris.It can be easy to remove and replace as part of routine maintenance.2. Filters maintain cleaning performance while reducing infiltration of dust， pollen and other allergens into the air you breathe. For best results， filters should be replaced every 2 - 3 months.Package Included:2 x Bristle Brushes2 x Beater Brushes2 x 3-Armed Side Brushes2 x 6-Armed Side Brushes3 x Filters