It can be easy to remove and replace as part of routine maintenance. The angle brush is specially designed to have an angle of 26 degrees, and three 40mm brushes are used to clean the corners and the edges of the walls. It's easy to remove dirt, dust, and trash in corners and edges from the accessories, especially and pet's hair. For best results, spare parts should be replaced every 1 - 3 months. Replacement parts for RoboVac 11S 12 30C 15T 15C 35C robotic vacuum cleaner. Colour: as shown Material: plastic Package Contents: 2 x Roller brush 12 x Side brushes 12 x Filters 2 x Primary filter screen 2 x Cleaning brush Only the above package content, other products are not included. Note: Light reflection 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.