What a dumb design. As you can see they are about 1/2" off the ground so every small dip you wear them out with an accompanying scraping sound. Notice how they are just under the car and do not prevent crud from being thrown back by the wheel higher up. The wheel sticks out farther than the well well so they definitely need to go up higher along the wheel well to prevent this. I would say their effectiveness is about 10% and that is being generous. Definately do not recommend, really need some better designed after market ones to hit the shelves.