Acoustimac DMD-312 Acoustic Panel Stagger 6-Pack. Covers 18 Sq. feet total. These panels are loaded with high performance 4lb Rockwool Insulation. Each panel is crafted right here in the USA, using high grade cabinet plywood, and wrapped in our Trademark DMD Acoustically Transparent Fabric. All Acoustimac Acoustic Panels are wrapped on front and sides in fabric, and have a wooden backing. This pack of 6 panels, comes in two colors to be arranged in an alternating staggered design. (Suggestion only, you can place them however you like) and Includes easy to install Mounting Hardware for all of them. Arranging them using the stagger design provides an optimized deployment for best results. They have an NRC Ratings of .95 or higher, which makes them your best choice for treating acoustically problematic spaces for echo and reverb.