eufy Replacement Side Brush Compatible with eufy C10 Suggested replacement frequency: 3-6 months recommended replacement, depending on your usage frequency. 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. Side Brush Stockpile: Set includes 2 side brushes, Meeting your at least a 3-month usage requirement. Authentic eufy Accessory: To extend the lifespan of your vacuum cleaner, please purchase genuine official accessories.