These Black Absorbing Acoustical Ceiling Tiles are 1″ thick, and measure 23.75″ x 23.75″ to fit in drop ceiling grid. These black Acoustical Ceiling Tiles are perfect for creating a sound absorbing ceiling and work with existing grid ceilings. The tiles are finished with a crisp, matte black fabric. Building a drop ceiling with excellent sound absorption is simple and affordable with these acoustical tiles. Acoustical Ceiling Tiles are lightweight and easy to cut with a standard utility knife. These packages of 1″ boards will cover 80 square feet. Each pack contains 20 boards. Acoustical Ceiling Tiles eliminate unwanted ceiling boundary reflections and control excessive room reverberation. These ceiling tiles both visually and audibly “disappear” by improving signal-to-noise ratio for listening, recording, and conversation. Creating a custom acoustical tile ceiling is simple and easy to install. Acoustical Ceiling Tiles can be cut to size with a utility knife, and they are designed to be installed in a standard drop ceiling grid. It offers the buyer a low cost solution and easy installation that is ideal for the do-it-yourselfers. Features: High NRC 3# densityClass A Fire Rated Spec-equivalent for Owens-Corning Select Sound Black Acoustic BoardContent: Fiberglass1 Pack – Covers 80 Sq. Ft. Applications:Home theaters, media roomsRecording and broadcast studiosClubs, restaurants, entertainment facilitiesTheaters and performing arts spacesShipping Info:No weekend shipments or holiday shipments. Item ships FREE via fed-ex ground *Note: Photo may not be representative of actual size.