Sweeper actually help to control dust as it sweeps. The Sweeper had actually has 2 forms of bristles. The hard bristles are a heavier polypropylene bristle that moves the heavier debris, and helps to control the dust that is being sweeped up. The soft bristles are great for sweeping indoor or outdoor surfaces. The bristles are attached to a plastic block that will not crack, warp, or mildew when used with water.