Armstrong Cortega tiles are purchased in boxes of 16 Technical DetailsSize: 1200x600</li> Quantity: 10 Sound absorption alpha w: 0.55 (H) Sound absorption (NRC): 0.55 Sound attenuation Dncw (dB): 34 Light reflectance (%): 80 Relative humidity (%RH): 70 Thermal conductivity (W/m?C): 0.0562 Fire reaction: Class 0 / Class 1 (BS 476 Weight (kg/m2): 3.5Ceiling tiles should be stored flat in clean and dry conditions As products may be modified or retested it's essential to check the manufacturers specifications.</p>