I own a custom electronics integration company that specializes in home cinemas, music studios and media rooms. In my humble opinion, these are the real deal. Foam For You provides VERY dense acoustic foam treatments, not the thin, lightweight material found on Amazon. This is Grade A U.S.A, commercial grade acoustic foam. I have about 24 wedges from Amazon 8x11”. One of these 5.5” cubes weighs more than a Chinese wedge more than 2x its size.
These will work PERFECTLY in my personal new music studio.