General description: This product is a set of main brushes designed for robotic vacuum cleaners. Material: Durable rubber and sturdy plastic. Shape: Cylindrical with flexible blades. Color: Black. Function: Effectively removes dirt from hard floors and carpets. Lightweight for easy replacement. Designed for smooth rotation inside the cleaning unit. Compatibility: These brushes are compatible with iRobot Roomba i7, i7+, E5, E6, and E7 series models. They directly replace the original worn brush. No additional tools are required for installation. This set does not include the filter or side brush, only the main rollers. Instructions for use: Turn off the device and turn it upside down. Open the brush compartment cover. Remove the axle and the old brush. Insert the new brush and align the drive squares. Replace the axle and lock the cover until it clicks. Check that it rotates freely before use. Other information: The package contains 4 identical main brush heads. It is recommended to replace the brush head every 6 to 12 months depending on the frequency of use. Clean the ends regularly to prevent hair from accumulating. Store spare parts in a dry place.