Compatibility - The roller brushes for iRobot Roomba s9 (9150) s9+ s9 Plus (9550) s Series vacuum cleanerHigh quality rubber roller brush - Environmentally friendly material, durable, delicate and soft, effectively help the robot vacuum cleaner clean the floorEasy to replace - Snap into place for quick and effortless routine replacement. No tools required, easy replacement of the main brushColor: GreenMaterial: PlasticKeep your vacuum cleaner running at peak performanceMore environmentally friendly material, durable, delicate and soft, effectively clean the floor and remove more dirt, dust and debris. Maintenance:To maintain peak performance, the replacement roller brush should be replaced every 2-3 months, depending on your frequency of use. Package Contents: 2 Pairs of Main Brushes. Only the above package content, other products are not included. item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.