... :2008 3.make as the drawing pressed round copper metal parts Stamping parts material Ag Cu, brass, bronze, CuSn, CuNi, Ni, CuNiZn ... , and so onWelding point material Ag, AgNi, AgCuNi, and AgSnO2 Application Micro switch, push-button ... or drawing. ISO 9001-2008Company show: 2013 special pressed round copper metal parts with contact