Cortega Ceiling Tiles from Armstrong Ceilings feature a medium, non-directional texture with a square lay-in edge for a clean drop ceiling appearance. Size: 24 inches by 48 inches by 5/8 inch. These mineral fiber ceiling tiles install easily in a standard 15/16 inch suspended grid system. With an NRC of 0.55 and a CAC of 35, these tiles provide excellent sound absorption and blocking performance. Featuring ASTM E84 Class A fire performance certified by UL, they meet high safety standards. With up to 41 percent recycled content and a light reflectance of 80 percent, these tiles are both sustainable and functional. Each carton contains 12 pieces covering 96 square feet. Suitable for storage rooms, utility rooms, and basement ceilings.