24 Pack-12 x 12 x 2 Inches Pyramid Designed Acoustic Foam Panels, Sound Proof Foam Panels Black, High Density and Fire Resistant Acoustic Panels, Sound Panels, Studio Foam for Wall and Ceiling

These work really well. I didn't wait 2 days. I had them ready to post up within 6 hours. After pulling it out of the plastic they began to rise by themselves. I quicken the process by simply gently pulling the stubborn corners in each direction. I also got them to fluff evenly all around by gently tugging opposite corners as well as the mid left side to right side. Pulling too hard would probably rip it.To rid of the smell quickly I stood each square upright in my bathroom-- some against the wall, and some leaning on each other-- so it can air out. The major thing that helped here is that I have an exhaust fan in the bathroom, and so by closing the door it sucked air through the foam even more quickly. Didn't have to stink up the house or leave it outside where allergens might grab on.As for adhesion, the thing that worked for me was letting spray adhesive on the backside, and then using velcro with the adhesive backs on them.This doesn't cancel out noise completely like some people expect here... but it definitely does a great job dampening to a large extent. I have thin windows, and the neighbor hasn't had a problem with me since.

Turned my closet into a vocal booth with a couple packs of this. Works great. The only challenge is getting them to stick to the wall. What you think will work probably won't.

I bought these as I worked from home. They do reduce ambient noises in the environment but not high frequencies of noise like normal talking. Looking in up on YouTube, that’s what a person stated. The flat sound proofing panels would be better.

It didn't come with a way to put it on the wall. I had to use a staple gun to get these to work. They have reduced the sound in my room and has helped improved insulation, not as cold anymore.

Precisely what I was seeking for my wall. Some panels exhibited a slightly gray tint compared to black, but the finish remained consistent with my expectations.

Some customers have left review stating that the foam did not decompress very well. This is true on some of the tiles, but the instructions say that you have to soak the tiles in water. Not all of them just the ones that don’t decompress well.These are good. Actually, very good.

The media could not be loaded. The smell isnt great, and it takes a day to expand, but it's worth the price and effort.Dont get 'spun up' regarding how long it takes for the foam tiles to expand. A sound engineer will tell you there are only two ways to get these to the intended size and shape:1. Wait. Let them sit in your garage or patio because the smell can be a bit 'much'. It will normally be 12-48 hours for full expansion.2. Wrinse & Dry. Think of them like a new sponge. Dunk them in a bucket or sink until they expand. Squeese them if necessary to expand stubborn flat spots. Then, toss them in the dryer at a low-to-medium setting for about 25 to 30 minutes. I was afraid to run them any longer because I pictured a melted blob in my dryer if I did it for too long. The result was that I had to dry them in batches several times.BELIEVE IT OR NOT... No. 2 is actually the easier way.I rated adhesion and absorbency as 1/5 because they dont come with adhesive, and absorbency is not their intended purpose.If you need to mount these (and I cant see how you wouldnt need to) it is my highest recommendation to use Scotch 6065 Spray Adhesive REPOSITIONABLE. Elmers & Loctite also sell a similar product but it does not hold as well - you actually cant mount these using Elmers & Loctite if you follow the directions on the can.This is why I recommend using the Scotch 6065 for mounting.As acoustic treatment, these panels work just as well as any other more expensive brand. Dont believe the hype about expensive acoustic treatments. There may be SOME difference between the pyramid and the wedge style of foam panels, but trust me that the difference is negligible.JHAScotch 6065 https://www.amazon.com/dp/B00YR9E3VC?psc=1&ref=ppx_yo2ov_dt_b_product_details

Low quality of product overall, I used this as a back panel to sound proof a door. It gave good results but I did not get the full 34 feet of material. My space was 30” x 84” or about 21 feet and just made it. Six of the panels were damaged on one row or more plus four were flat. See pictures. If you need this buy more than you need or be disappointed. Thanks