This is a brush module ASSY removed from an iRobot Roomba 890 (2017 model). This item has been tested and is in working condition. It can be installed on 800-900 series models. How about using it to replace a faulty brush? The item has been lightly cleaned overall, but some dust remains. Please understand that this item is sold as-is (returns are not accepted except for critical defects such as non-operation). (It's priced lower for this reason.) ※ Important: In the event of any defects or damage during shipping, we will be unable to assist you after you leave feedback. Please be sure to inspect the item before leaving feedback. We generally do not offer price reductions. Questions regarding price will be deleted.