1. The bristles are product of nylon, which is strong and . 2. Suggestion: clear after every single 1-3 occasions of use (depending at the quantity of cleansing on your home). 3. Regular replacement can that your house robotic maintains its performance! Material:Nylon + plastic colour:White Package Contents: 2 x Sweeper facet brush Only the above equipment content, different merchandise should not included. Note: Light reflection and assorted exhibits can cause the colour of the thing within the photo considerably diversified from the genuine thing. The length allowed error is +/- 1-3cm.