Compatibility- This replacement accessory kit is compatible with iRobot Roomba 800 850 851 860 865 866 870 871 876 880 885 886 890 891 896 900 960 966 980 990. Each package includes 4 x filter, 4 x brush side and 4 x screws, 2 x sets of rubber rollers. Washable and Reusable Main Brush- Innovative anti-rotation debris extractors break down debris and lift dirt to remove dirt, grime dust and debris. The rubber extractor can be removed and cleaned independently. HEPA Filter- Reduce dust, pollen and other allergens in the air you breathe and improve air quality. Purify the air, breathe healthy air, and provide you with a safer and more comfortable home. Side Brush- Screws are included, easy to use. The side brush is made of thermoplastic elastomer and nylon, it will not damage the floor. Effectively remove dirt, dust and debris from corners and edges. Easy to collect hair. High Quality- Made of environmental protection materials and high strength. It is rigorously tested for compatibility and durability. Easy to install and offers good durability. For best results, filters should be replaced every 2-3 months.