ITEM NAME:25X25X5CM Sound Insulation Foam Egg Crate Studio Acoustic Foam Sound Insula Q5V3 25X25X5CM Sound Insulation Foam Egg Crate Studio Acoustic Foam Sound Insula Q5V3 Each WEDGE comes uncompressed and in prime.Thin foam, over a large area, has less of a chance of distorted and muffling the sounds reverberation. The uniform wedge design help trap airborne noise while alleviating flutter echo and slap back.