Replacement parts accessory kits designed for compatibility with Roomba Combo series robots. To maintain optimal vacuum performance, especially for pet owners, it is recommended to replace accessories every two months. Durable components are easy to install and help extend the life of your robot vacuum. Compatible with Roomba Combo Series models, including Combo 113 R113840. (Please verify your vacuum model before purchase.) Note: If the side brush or main brush bristles curl during packaging, this is normal. Soak them in hot water (approximately 85C) for several minutes to restore their shape. This does not affect quality or performance. Tip: Replace parts every 2 to 3 months, depending on usage frequency. Color: green. Material: plastic. Size: approximately 177mm in length. Package includes: 2 x Main brush. Other items not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3cm.