Bought 8 inserts that were to cut down on my road noise. I live about 80 feet from a 4 lane road. One thing I didn't like about the company was after me telling them I would not be able to meet the driver due to the road traffic and me being a senior who has had 4 left knee surgeries the driver was never told about the road and my condition. The driver was nice enough to meet me at a Kohls's parking lot and he and my buddy got the inserts in our pickup. The wait for them to be finished was almost 3 months. The noise is reduced by about 65%. Still hear motorcycles and trucks with loud mufflers like before. After paying $2600 one would wish for more.