General description Replacement Main Brush, Side Brush, and HEPA Filter set designed for iRobot Roomba 900 Series (960, 990) vacuum cleaners. Made from high-strength, environmentally friendly materials, this set helps maintain the cleaning performance of your vacuum while reducing the penetration of dust, pollen, and other allergens into the air. Technical specifications Material: Plastic Package Contents: 2 x Rolling Brush 6 x Side Brushes 6 x Filters 1 x Cleaning Brush Measurement allowed error: +/- 1-3 cm Usage It is recommended to replace the brushes and filters every 1 to 2 months to ensure optimal performance.