2x12x12 (12 Pk) DARK GREEN/CHARCOAL Acoustic Wedge Soundproofing Studio Foam Tiles Pack of 12. Covers 12 square feet. Effective against standing waves and flutter echoes in most small-to-medium sized rooms. For use in vocal booths, control rooms and studios. Overall NRC: 0.65 Functions as a full frequency bandwidth absorber for any size room when used in conjunction with corner bass absorbers and male/female broadband absorbers. Made in U.S.A.