CONTINUOUS SOUND ABSORBING PERFORATIONS FOR A MONOLITHIC APPEARANCE Product Details: Perforation: 8mm / 18mm o.c. Panel Thickness: 1/2″, 12.5mm Non-Woven Fabric: Charcoal Gray Open Rate: 15.5% NRC: Up to .85 Board Sizes: 1188 mm x 1998 mm 1188 mm x 2394 mm 900 mm x 2700 mm Product Data Sheet: Sonus Round 8/18