Describe Produced by environmentally polyurethane foam.In order to improve the opening steps and specific acoustic characteristics, make it not only has the sound absorption characteristics effectively, without any harm to human body Specifications: Material:nvironmentally polyurethane foam Color:black Size:30x30cm（12\"x12\") Thickness:5cm / 2\" 2 inch wedge foam is effective against standing waves and flutter echoes in most small-to-medium sized rooms like vocal booths, control rooms and studios. It also functions as a full frequency bandwidth absorber for any size room when used in conjunction with corner bass absorbers and male/female broadband absorbers" }