Great Value Package: Rolling Brush & Brush Guard + High-Performance Filter x2 + Side Brush x2 + Dust Bag x3. The products are made of high-quality materials to ensure optimal performance and a healthier lifestyle. Compatible with eufy Robot Vacuum 3-in-1 E20. Replacement Frequency: Please clean the filter frequently. We recommend replacing the brush and filter every 2-3 months, also depending on the frequency of use, to keep the vacuum working at high performance and extend your vacuum Cleaner's life. Tool-Free Installation: Effortlessly replace parts on your Robot Vacuum with a simple, straightforward process that requires no additional tools, making it an easy-to-use cleaning tool. Note: To protect your robot vacuum and extend its lifespan, we recommend using authentic eufy replacement parts. We¡¯ve received complaints about non-compliant sellers offering substandard alternatives.