These "soundproof panels" don't block any sound, not even 1db, which is unbelievable even for these... It's a waste of money unfortunately, and obviously I'm not satisfied with the result!! I would be if I got my money back but since I know that will never happen, my opinion will not change no matter what!!

It's not of any crazy quality, it's more suitable for decoration and besides that, the foam takes a very long time to return to its normal shape...

Good sound result and easy installation on a large surface, but there is significant waste. Many pieces (2–4 per pack of 25) never returned to their original shape, probably due to pressure during packaging, storage or transport, or because they are not evenly cut.

when you take them out of the box they have a very unpleasant smell. I left them outside for days and they still don't stop smelling. I put them in my room and the smell started to give me a headache and I couldn't sleep in the room. DO NOT BUY.

I got a piece to record the sound of the motorcycle. I wrap the microphone inside it and put it in the backpack. It cuts out unwanted sounds from the wind.

I tried the two-tone black and gray of the same brand since I saw it from someone in the reviews. They look very high quality, decompressed quickly, and overall they are as I expected.

Very good material. It takes 2-3 days to recover from the pressure in the package. The soundproofing result is quite good.

They are quite thick and decompressed right away. I got the black ones but also a pack of 25 gray ones from this company. In terms of appearance, the photos speak for themselves! Practically, I am very satisfied, especially considering their price. They were placed in a semi-professional recording studio, and both the echo and external noise were significantly reduced. I will definitely return with a new order for black ones as well as gray ones since the two-tone matched perfectly with my space.

I am a third-year violin student and next year I will take exams to get my diploma. Due to the difficulty of the pieces and their volume, I am forced to practice several hours a day, resulting in me being heard throughout the entire apartment building. However, since I got these soundproofing materials and set up something like a little studio, the sound has significantly decreased to the point where a neighbor caught me and asked if I am still playing the violin or if I have given it up. This is also the reason I am leaving this review. I highly recommend them!