Compatibility: Replacement parts for Roomba Combo compatible with all models: R1138, R111840. 【High-efficiency rollers】Includes 1 high-quality Roomba central brush, designed to keep your robot in optimal cleaning condition. Guaranteed durability: These accessories are made of durable materials and tested to ensure long-lasting use and consistent performance. Efficient cleaning: The vacuum cleaner's central brush effectively removes dirt, dust and debris from corners and edges, including your hair and your pets' hair. Note: The data are all measured manually, please allow an error of 1-3 cm due to differences in light and display, there may be color differences, please refer to the actual item received.