Our free stainding corner bass traps are very effective at reducing low frequency reverberation and controling room modes. They come 4 feet high by 2 feet wide and feture 3 leveling feet as well as hanging brackets. They can stand on the floor, hung in the middle of the wall or they can be stacked from floor to celing. They are made with a wood frame and a plywood top and bottem for long lasting durability.