4 PCS Black Acoustic Foam, 48"X 24"X 2" Egg Crate Foam, Soundproof Foam, Fireproof Studio Foam Panels, Sound Absorbing Foam, Sound Proof Foam Panels, Sound Proof Panels For Walls

I use this for my pond prefilter. It does an outstanding job of polishing the water. I always had particles floating in my pond water when using just the expensive pressure filter. I change the foam filter every few days, wash, and reinstall. Now my pond stays crystal clear. ;)

Expanded just fine within a few hours of removing from the package.

I would buy again

It was fine, cost too much for what it is. Sticky things are worthless.

We are using this to cancel out the background noise. So far its done a good job

These really helped to remove the secondary echo sounds in my recordings. I used the stickers they provided to hang them and they worked well. These two large sections cover a corner mic set up very well. The foam itself feels rather durable and somewhat firm. Very happy with it.

The media could not be loaded.  What we needed these panels for was weird, but we essentially needed them for insulation inside our camper, and help with noise reduction. We used this on the door in strips as well as a single panel in the front window to help with sealing up some issues. These panels were PERFECT! There were two that came, they were green, and they are AMAZING FOAM PANELS! They are legit and helped with everything from acoustics to sealing up air flow issues. PERFECT! Worth it!

I do a children's show online and sometimes the audio can be a bit echo-ey in spite of my rug and sound mat buffers. I needed something to put on the walls as well and it is only a small corner of the house so these were perfect. I opened them and let them fluff up from being wrapped tightly. It did not take more than a couple of hours (maybe less as I left them under some books for while to help flatten them out). I could not get them to stick securely to the walls so my husband helped me with some adhesive velcro strips he had and now they stay up and are easy to take down if I needed to. They are a darker purple color but they are out of sight for the videos and audio recordings so that is fine.