The TORQUE DRIVE motorized brush monitors the resistance of the cleaning brush roller (360 samples per second) and automatically adjusts the device's power to the type of surface being vacuumed. This allows for thorough cleaning of both carpets and much harder subfloors without the need to change cleaning heads. The replaceable roller is equipped with black antistatic carbon fibers and stiff nylon bristles. Roller color: nickel-plated.