[Compatibility] - Replacement Parts Kit for iRobot Roomba s9 (9150) s9+ s9 Plus (9550) s Series Vacuum Cleaner [Includes] - 1 Set of Multi-Surface Rubber Brushes. [Advanced] - Wide dual rubber brushes effectively clean large areas and work together to help clean floors thoroughly; One brush loosens and agitates dirt, and the other moves in the opposite direction to extract and pull it. [Material] - The rubber roller brush is made of high strength material and environmental protection, effectively help the robot vacuum cleaner to clean the floor. [Easy to replace] - Quick and effortless routine replacement. No tools required, easy main brush replacement.