12 Pack Self-Adhesive Soundproof Wall Panels, 12 x 12 x 0.47 In Sound Proof Foam Panels for Walls, 1.2lb/ft³ High Density, Thicker 0.47in, Acoustic Panels, Noise Dampening Panels Studio Gray

I used these on the back of a couple bifold doors to a laundry room and there is a noticeable difference in sound dampening. They were easy to install and the adhesive seems very strong.

Very good on sound proofing, and is easy to install. Really worth the price.

These decorative insulation panels are very good. The glue is very strong and they are installed quickly. I totally recommend them.

I am impressed with the sound reduction of the traffic outside my house. I didn’t think it would make much difference but now my dog doesn’t bark every time the UPS truck drives by!

I've had the product on the wall for about 3 days now, and so far it seems to be holding good. I was a little concerned about the adhesive, but I'm growing more confident in it with each passing day. I will update if it fails.The acoustic dampening is night and day in my small echoey basement. There was an immediate improvement to the general atmosphere, conversations are easier, music sounds better.

I put it on a metal door to absorb the noise. It looks fabulous and made the room look so classy.

My doors are hollow and I needed something to block out the noise from outside my room. I put this on the inside of my door and it worked great!

These are alright so far as thinner noise diffusers go. Unfortunately, I'm starting to learn that these thinner noise diffusers are not, as a class, particularly useful for most applications. This is because they are incapable of managing lower frequency sound buildup, which is the biggest issue in most audio treatment scenarios.I think these look nice and work well enough at what they are. But they cannot be a complete solution.