Silver/Copper Contact is in low concentrations increases the mechanical hardness ... 3,Usage:relay,switch,contactor,breaker,thermostat 4,ISO9001,SGSContact Rivets,Solid Rivets,Pure Silver RivetsCertificate ISO 9001:2008, RoHS, SGS, etcMaterialsAgCu, AgCdO ... pay the tooling charge if the cost is too high.Meanwhile the express fee should be paid by the ... to our company. Please do not hesitate to contact us!