The Dreame RMB13 is a replacement main floor cleaning roller designed to keep your vacuum operating efficiently. This brush features a spiral anti-tangle design, which helps prevent hair and debris from wrapping around the roller, making maintenance easier for you between deep cleans. It is compatible with a wide range of models, including the X50 Ultra, X50 Master, L50 Ultra, L50 Pro Ultra, L40s Ultra, L40s Pro Ultra, D20, D20 Plus, and the Aqua 10 Ultra. This ensures that your device maintains its original cleaning performance across various floor types.