Maintenance Kit for Roomba 500 Series includes replacement bristle brush with end caps and bearings, flexible beater brush with bearings, side brush with screw, three reusable filters and a brush cleaning tool. Compatible with all Roomba 500 Series models. STANDARD FEATURESMaintenance kit keeps your Roomba 500 Series Vacuuming Robot cleaning at peak performanceWHAT'S IN THE BOX 1 Replacement Bristle Brush with End Caps and Bearings 1 Flexible Beater Brush with Bearings 1 Side Brush with Screw 3 Reusable Filters Brush Cleaning Tool