1. compatibility: The speed cleaning brush is compatible with Roborock S8 MaxV Ultra/S8 Max Ultra/S8 Pro Ultra, S7 MaxV Ultra, and S7 Pro Ultra (Note: It is not the main roller brush). 2. performance: Rotates at 500 RPM to clean the mop effectively and thoroughly. During mop cleaning, dirty water in the dock base is directed to the outlet and pumped into the dirty water tank. 3. Easy installation: The speed cleaning brush is matched and installed the same way as original parts, making it simple to use. Removable and washable, it resists hair tangling—just plug in and pull to remove tangled hair or debris. 4. materials: Crafted with precision, the speed cleaning brush is made of ecofriendly materials, ensuring no environmental pollution. Its bristles are quality nylon, offering durability and cleaning performance compared to other brands.