1,chemical etching process; 2,different sorts of materials,&different shapes available; 3,low cost &best quality; metal phone keyboardWe're very experienced in making precision component, we use different craft processes and materisls to produce our products. 1,Product thickness can be achieved between 0.03 to 1.5mm; 2,Product size can be achieved between 1* 1mm to 300* 500mm; 3,Smallest open ...