Provides a good shield from door mounting locations, helps with vibrations and is flexible and easy to work with. For the $$ you cannot go wrong.

I was upgrading the tunes in my old Chevy pickup, and had bought four great JVC speakers. Two were mounted in the doors, and I needed to make housings for the other two to sit in the back lower corners in the cab. Having added speakers to an old truck's doors before, I anticipated a tinny, hollow sound. I bought these baffles to eliminate that tinny sound if I had just mounted the speakers alone, plus, old trucks tend to leak, so these baffles would also keep the speakers dry if rain seeped in. Right off, the decision was a good one, as the speakers sound like speakers should. And, we've had quite a few gully-washer rains, and the speakers stayed dry. For the small cost of these baffles, they are a great investment!

They are nice if you're worried about water getting in your door and onto your speakers, but don't expect them to do anything for your sound quality. They can buzz loudly if your speakers make any bass.