As Soundproof Foam they work well. But the colors are much to bright compare to the pictures, i can deal with some difference that is normal. But the pictures have very dark black and very dark red, but in reality its very bright red and very bright black.I give a minus star on that.
The Cut sizes are not even so it is more difficult to merg them nicely due to that i give another minus on the star.
I would also give a third minus star due to the price on the product. They feel like china foam that costs 5 usd in total and not 50 usd