Auralex ProPanels 1 Inch Thick and 4 Feet by 2 Feet Fabric Wrapped Acoustic Absorption Panels, Obsidian High density, class A fire rated acoustical fiberglass. Absorbs mid/high frequency reflections to control the ambience of any room. Alleviates flutter echo and slap back. Rigid, fabric wrapped fiberglass with a finished bevelled edge. Standard impaling clips for flush wall mounting included.