Usage Tips:PERFECT FIT - Compatible with iRobot Roomba i7 i7+ i3 i3+ i4 i6 i6+ i8 i8+/Plus E5 E6 E7 Robot Vacuum Cleaner. This set works as great as the ones, precision fit and easy install. VALUABLE PACKAGE - Includes 4 set of dual multi-surface rubber brush rollers. The products are made of high-strength and environmentally friendly materials to ensure optimal performance and a healthier lifestyle. HIGHLY EFFICIENT FILTERING TECHNOLOGY - Unique Dual Multi-Surface Rubber Brushes don't get tangled with pet hair. Brushes adjust and flex to stay in constant contact with carpets and hard floors. EASY TO CLEAN AND REPLACE - Regularly clean and replace roller brush to improve suction and performance and extends the life of your robot vacuum. Colour: green Material: plastic + sponge Size: About 185mm in length Package Contents: 4 set x replacement roller brushes Only the above package content, other products are not included. Note: Light shooting 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.