The high-efficiency filter is made from a special material that captures 99% of allergens from mold, pollen, and dust mites. The corner brush is specifically designed at a 26-degree angle and uses five 30 mm brushes to clean deep into corners and along wall edges. The wide dual rubber brushes efficiently clean large areas and work together to ensure floors are thoroughly clean. One brush loosens and moves the dirt while the other works in the opposite direction to suction and remove it. This set includes everything you need to maintain your robot's cleaning performance in a convenient package. Compatible only with Roomba® s-series vacuum cleaning robots.