(12) 2'x4'x2" wedge, 96 sq.ft. 2" Studiofoam Wedges are the most popular seller and the best overall absorber! Use 'em to treat small - to medium-sized areas including vocal booths, control rooms and sound studios. They effectively kill standing waves and flutter echoes and, when used in conjunction with the LENRD or Venus Bass Traps or the Sunburst Broadband Absorbers, can effectively tame the full frequency bandwidth in virtually any room. 2" acoustic Studiofoam is quite simply the workhorse of the industry and is ythe safest bet if you're tuning ythe room ytheself without the help of a professional acoustician.