General description Brand new and high quality replacement parts for Ecovacs T8, T9, and T9AIVI robotic vacuums. Made of high-strength and 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 Color: as shown Material: plastic Package Contents: 2 rollers, 12 side brushes, 6 HEPA filters Measurement allowed error: +/- 1-3 cm Usage It is suggested to replace the filters every 1 to 2 months to ensure optimal performance.