... rivet/button. According to customers engineer drawing Face material: Solid or bimetal Ag,AgNi,AgCdO,AgSnO2,AgSnO2InO3,AgZnOBase material: Cu, CuNi ... Normal: 1.0mm-8.0mm, According to customers drawing or samplesilver thickness: 0.15mm-solid Normal: 0.6-4.0mm ... it is more difficult to processing these two materialsUsage:Breaker,relay,contactor,timer,thermostat,train,swithes and other home appliances ...