Suitable For smart sweeping robot: -RM72VR -RM96W -RM84V -RM52VR -RM94W -RM72VS -RM72VG and other models Bristles symmetry and side brush bearings fit tightly are good for cleaning more effectively.Each come with 3 arms side brush. Function:By rotating soft brush, the wall and the corner of dust swept into the suction port, inhaled dust box for centralized storage. the side brush is consumable parts , before cleaning is recommended to check each side brush. the side bristles deformed into the warm water soak a few minutes, and then the bristles get straight, until dry and then you can use. Color:Black+Blue material: plastic Size: Side brush length 5cm Package included: 4* Side Brush Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.