Brush 2 sides: convenient vacuum cleaner side brush, nylon brush, will not scratch the floor and furniture, unique design, easy to clean pick up hair.Assembly Kits and Parts for Xiaomi Roborock MI S50 S51 S55 S5 S6 Robot. Specifications: Rolling brush size: 9.8 x 4 cm. Filter size: 16.5 x 6 cm. Side brush size: 6 cm. Rolling brush weight: 68 grams. Filter Size: 67g/piece. Side Size : 13g/piece. How to replace the roller brush: Pull the tab to remove the roller brush cover. 2. Hold the old roller brush firmly and lift it out. 3. Properly align the tip. of the new rotating brush with the groove to; to install. 4. Replace the brush cover and push it into place. How to replace the side brush: 1. Roll the robot on a horizontal surface. The brush is located at the front with shiny connectors. 2. Place a plastic opening tool (or a coin) under the edge of the brush head. 3. Gently withdraw the opening tool (or coin) to fully extend the brush. 4. Simply push the new side brush towards the connector to replace it. Contents: 1 roller brush. 2 filters. 2 side brushes.