These Airaid SynthaFlow air filters feature multiple layers of oiled cotton gauze combined with their unique synthetic materials technology, resulting in a superior filtration system. The SynthaFlow technology provides maximized filtration efficiency without sacrificing airflow. That translates into more horsepower, torque, and increased mpg for your vehicle. Airaid SynthaFlow air filters come pre-oiled and are washable, reusable, and will filter out the smallest dirt particles that standard cotton gauze filters can't capture.