【Compatibility】Replacement brush for iRobot Roomba i7+ E5 E6 I3 and other models. 【High Performance】This set works as well as the original, with precise fit and easy installation. 【Efficient Cleaning】This i7 plus roller brush accessory fits all types of flat floors. 【Value Package】4 sets of roller brush accessories for iRobot i7. (Note: There may be some noise when the rollers are first used, but it will disappear after a period of use.)