... product that you make your own choice for engraving any picture on it. This product not ... speed, lower cost, no limit for the engraving area, can engraving whatever plane or bend surface, No noise, ... than 1/10 price compare with the laser engraving product, besides, with clearly, enduring, no change ... mould, the manufacturing of forming electrode for electric spark, 24 k gold and pure silver goods, ...