General description Replacement Parts Main Brush for IRobot Roomba S9 (9150) S9+ S9 Plus (9550) S Series S9 S9+ Vacuum Cleaner is designed with new high-quality materials, ensuring durability and a perfect match for your equipment. Keeping your cleaning accessories in top condition helps maintain your home robot's peak performance and reduces the infiltration of dust, pollen, and other allergens into the air. Technical specifications Material: Plastic Package Contents: 2 groups x main brush Measurement allowed error: +/- 1-3 cm Usage To achieve the best cleaning and filtering effect, it is recommended to replace the cleaning accessories every 2-3 months, depending on usage frequency. The HEPA filter included can improve air quality and reduce particle size by up to 99.97%, effectively removing household dust, pet dander, and more. Additionally, the pre-filter helps reduce unpleasant odors from pets, smoke, cooking fumes, and various household products and chemicals.