The 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.Instead of bristles that bend and can miss lots of dirt, our unique flexible rubber brushes hug different floor surfaces, staying in close contact with wood, and carpets, to help thoroughly clean your floors. One brush loosens and agitates dirt, and the other moves in the opposite direction to extract and pull it in.