Made of high quality material, Can be easily removed and replaced as part of normal maintenance. Easy to install and reliable to use It is recommended that you replace it every 2-3 months or thereafter to maintain the best performance of the machine. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! for X9 Pro Robot Vacuum Replacement Parts Colour:Photo Color Material:Plastic Package Contents: 2x roller brushes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.