The Replacement parts is compatible with s9 (9150) s9+ s9 plus (9550) robot vacuum cleaner High efficiency and high-quality rubber roller brush, environmentally friendly material, resistant, delicate and soft, effectively helps the robot vacuum cleaner to clean the floor Replace for filter every 2-3 months to maintain vacumm cleaning performance while reducing infiltration of dust Easy to Install: It is easy to install this vacuum brush kit without any complex steps Colour:As Shown Material:plastic+rubber Package Contents: 6 x main brush 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.