For the professional needing highly aesthetic acoustical treatments, Auralex C24 Pro Panels are decorative, fabric-wrapped Class A absorptive fiberglass panels with chemically hardened edges. These 2' by 4' panels have a 0.80 Noise Reduction Coefficient (NRC), and are 2 inches thick, thus yielding additional absorption at lower frequencies. Auralex C24 Pro Panels come in two colors, Sandstone and Obsidian, and include wall mounting hardware.