Eztronics Corp&reg; Bristle Brush Flexible Beater Brush Side Brush Filter Kit for Roomba 500 Professional Series 1 Bristle Brush with end caps and bearings 1 Flexible Beater Brush with bearings 1 Side Brush 3 Filters (not compatible with Robot SKUs 53601 and 55101 and AeroVac Bin SKUs 21632 and 21633) 1 Brush Cleaning Tool