This replacement main roller brush is designed specifically for the Roborock S7, T7S, and T7 Pro vacuum cleaners to maintain their cleaning efficiency. It features a combination of rubber and anti-tangle bristles that allow the device to perform deep cleaning across both hard floors and carpets without hair getting caught as easily. To keep your robot operating at its peak, it is recommended to replace this component every 2 to 4 months depending on how often you clean. The package includes one main roller brush, providing a simple way to refresh your vacuum's hardware for consistent debris pickup.