Polyethylene Foam is a closed cell foam that absorbs noise at the medium and high frequency ranges. This foam is very highly rated.
More Info On Polyethylene Planks
This Kit is guaranteed to sound proof your room!
5 White Wedge Foam Tiles 21” x 21” x 1-1/2” OR 3" thick
5 White Wedge Foam Tiles 21” x 3” x 1-1/2” OR 3" thick