Great soundproofing, but they need quite a bit of spray to stick to the wall. On the ones where I used a little spray and they fell off, they didn't leave any marks on the wall. I restored them to their original shape in a little while with a hairdryer.

Easy to use and install. It takes a little time to reach its normal size. I recommend a hair dryer outdoors; it takes about 2 minutes per tile with the dryer close to the product. The glue is just enough for the package, so don't waste any. Worth the money.

Very good set for basic use. They come compressed. The instructions mention using a hairdryer, hot water, or both to expand them to the proper size. If you're not in a hurry and have space, I suggest soaking them in hot water, gently squeezing them out, and letting them dry. The glue spray that accompanies it is good, there was no issue.

Attention, they have a process to open. It didn't work well for me with just a hairdryer, so they needed soaking in hot water and drying. I had bought 2 packages and for 50 pieces it took me 4 hours. The product is excellent.

Good quality! The only thing they don't mention is that it needs hot water and drying in order to inflate! They are compressed due to transportation!