SONEX Pyramids, Standard HPC Colors, 4" x 2' x 2', offer effective acoustic control in an attractive pattern suitable for architectural projects, conference rooms, multipurpose rooms and industrial facilities. SONEX Pyramid wall panels, 4" thick, feature a 0.95 Noise Reduction Coefficient (NRC) ranging from 0.85 to 1.10. The geometric design deflects and disperses sound waves, allowing the open cell willtec foam to convert sound energy into quiet, kinetic energy.