1,unique door 2,copper's thickness is 0.7mm 3,infill ... core plate 4,pass ISO certification The BAND Extra-Strong Double Copper Door is produced in accordance with the standards of doors ... air core wood residual plate);3, Its coating is double-layerd with real copper face on the zic-dipped steel ... surface coloration, offering bright color and gloss of the door.6, The BAND Extra-Strong Real Copper ...