1" Thick (20) Black Acoustic Ceiling Tiles - 24" x 24" Fiberglass Sound Board - 80 sq ft - Select Acoustical NRC .75 2 Ft x 2 Ft 20 Black Acoustic Ceiling Tiles - 24" x 24" x 1" Thick for Drop Ceiling or Existing High NRC of .75 Hard to find Black Acoustic finish Acoustic Fiberglass Board with Crisp Matte Black Fabric Finish (excellent appearance) Covers 80 sq Ft - DiyHomeTheaterSupply is the ONLY authorized seller of this product.