iRobot Roomba 500 Series Replenishment Kit For Red and Green Cleaning Heads Replacement-brush and filters kit for Roomba 500 Series cleaners with red and green cleaning heads Includes bristle brush, flexible beater brush, and side brush with screw Also provides brush-cleaning tool and 3 reusable dust-reducing filters Helps keep vacuum cleaner (sold separately) in good working order Measures approximately 8 by 9-1/5 by 3-3/5 inches