... board, gold, silver,copper, iron, stannum etc, it ' s a new technology product that you make your own choice for engraving ... the prize of many national patents, includes: Patent of practicality new type 012101210661.5, patent of outside design 01 3 10638.4 ... materials on decorated plating, odd metal plating, alloy plating, special type plating, etc. it not only for hanging plating, but roll ...