In order to give you a better user experience, check the size and model of the accessories before buying, thank you for your understanding. We put two filters in one paper box, so please kindly open all inner packages to check the quantity. Product Information: use for Robo Rock S50 S51 S52 S53 S54 S55 S5 S5MAX S6 S6PURE S6MAXV XIAOWA E2 E3 E4 XIAOMI 1 1S Features: 1. Clean brushes keep your home robot at best performance. 2. The side brushes are easily removed and replaced as part of normal maintenance. 3. Filters maintain the cleaning efficiency of the robot while reducing the ingress of dust, pollen and other allergens to the air you breathe. 4. For best results, filters should be replaced every 2 to 3 months. 5. For use with Xiaomi MI Robot only. 6. Vacuum cleaner accessories are of high quality. It is made of high-strength and environmentally friendly materials. 7. The accessories are easy to remove dirt, dust, and trash in corners and edges effectively. Especially your hair and your pet's hair. 8. Accessories parts are durable and easy to install, Make your robotic vacuum cleaner and longer. Notice: 1.Please allow 1-2cm error due to manual measurement.Please make sure you do not mind before you bid. 2.The colors may have different as the difference display,thanks for your understanding.