The replacement parts side brush compatible with Shark AV2501S/ AV2501AE/ RV2502AE/ RV2520AOUS/ AV2510AOUS Vacuum Cleaner.|No tools required, easy to replace the side brush.|To keep your AV2501S/RV2502AE AI Robot Vacuum running at high performance, the brushes are recommended to be replaced every 2-3 months.|Package Includes 4 Pack Side Brushes.|If you have any questions about the replacement parts, please feel free to contact us, we will respond in 24 hours.