Product Description 1. Clean brushes keep your place robotic working at height performance. 2. Side brushes are clean to take away and update as a part of habitual maintenance. 3. Replacement filters for Xiaomi Roborock S50 S51 Vacuum Cleaner Robots. 4. Filters maintain robot's cleaning functionality while decreasing infiltration of dust, pollen and diversified allergens into the air you breathe. 5. For ideal results, filters needs to be replaced each 2 - three months. Compatible with model: Item for Xiaomi Vauum 2 Roborock S50 S51 MI Robot Vacuum Cleaner SDJQR01RR SDJQR02RR SDJQR03RR