This is a set of 8 ASC SoundPanels. Each SoundPanel is 8″ wide, 48″ tall and 2.5″ deep. They can be mounted vertically or horizontally. If you have too much bass reverb or the treble frequencies a bit too sharp in your room, adding these 8 panels on to the walls in your listening room will help bring it in control. These were former DEMOs with minor scuff marks from being used as one but nothing major.