18 Pack Self-Adhesive Acoustic Absorption Panels, 12 X 12 X 0.4 Inches Sound proofing Insulation Absorption Panel High Density Beveled Edge Sound Panels, Acoustic Treatment for Home&Offices (Black)

Likes:1. The squares are in fact nicely square, I noticed no issues with how they lined up on each other.2. The black color is a pleasant and consistent black.3. The adhesive required very little pressure to push on and has held very nicely on a standard flat painted wall.4. The echo reduction is immediately noticeable, especially if you apply them on more than one surface.Complaints:1. It is annoyingly hard to get the backing off the adhesive, you have to either have long fingernails or get lucky. There were a few occasions when I had to tear a tiny bit of adhesive off before the backing would separate.2. You Definitely need to use a lint roller after installing, because there are loose fibers (not a huge deal, especially because the fibers are polyester, but I do recommend wearing a mask and rolling after application).Overall, a great product. I plan to order more of these to add to other walls, and possibly other rooms of the house.

Has no affect on noise reduction whatsoever.. no affect at alllllll

I stacked these inside my window panes, and the area above, within my bedroom. I covered all of the glass with a layer of 2 panels. This greatly reduced the noise coming in my window. The walls in my room already block noise well, so I didn't have to use them on anything but the window. My sound machine used to struggle to drown out these noises, but now I hardly hear any cars drive by, lawn mowers, etc.

These worked great. Size was consistent throughout. The adhesive worked great on a rough flat painted surface. They were used in a room where echo was an issue and they definitely helped.

The media could not be loaded.  I bought 10 packs of this product and some of the packs were cut differently than the others. So when we put them up to protect the walls for our home gym we noticed some were cut uneven. It's no biggie for us because it's for our walls for protection not for sound proof. If you are the kind of person picky then don't take a chance with this product. I took a black marker and filled the parts that show the inconsistencies.