General description Brand new and high quality replacement parts for iRobot Roomba S9 and S9 Plus vacuum cleaners. Made of high-strength, environmentally friendly materials, these accessories are designed to maintain the cleaning performance of your vacuum while reducing the penetration of dust, pollen, and other allergens into the air you breathe. Technical specifications Material: Plastic Package Contents: 6 side brushes, 8 HEPA filters Suggested replacement frequency: Every 1 to 2 months Measurement allowed error: +/- 1-3 cm