Compatibility: This roller brush is compatible with iRobot Roomba i6+ i7 i7+ i3 i3+ E5 E6 E7 Wi-Fi connected smart map robot vacuum cleaner. High Performance: Quick and easy replacement. Main brush easy to change without tools. This set works just as well as the originals, fits precisely, and is easy to install. Multi-Surface Rubber Brush: Uniquely designed rubber tread conforms to different floor surfaces and removes everything from small dust to large debris. Maintenance: Consumable replacement kits are replaced every 2-3 months depending your frequency of use to keep your robot in top working condition. Super Value Package: 1 set of roller brushes. (Note: There may be some noise when using the scroll wheel for the first time, but it will go away if you use it for a while.)