Replacement parts accessory kits are designed to be compatible with Combo series Roomba models. To maximize vacuum performance, especially for pet owners, it is recommended to replace accessories every two to three months depending on usage. Durable and easy to install, these parts help extend the life of your robot vacuum cleaner. Compatible with For Roomba Combo Series robot accessories. Compatible model: For Combo 113 R113840. (Please confirm your vacuum cleaner model before purchasing.) Note: If the side brush or main brush bristles curl during packaging, this is normal. You can place them in hot water (approximately 85°C) for several minutes to restore their shape. This will not affect quality or performance. Tips: Replace spare parts every 2 to 3 months based on usage frequency. Color: green. Material: plastic. Size: approximately 177mm in length. Package Contents: 2 x Main brush. Only the items listed are included; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.