eufy Side Brush, 2 pairs, Durable, Soft, Compatible with E25/E28Perfect Fit: Compatible with eufy Omni S1 Pro S1 E28 E25. To keep your Robot Vacuum operating at peak efficiency, replace the brush every 3 months, depending on usage frequency. Soft, flexible bristles clean effectively without damaging floors or furniture. No tools required, easy to replace the side brush. Important Note: For the best performance and to extend your robot vacuum's lifespan, we strongly recommend using authentic eufy replacement parts.