... your requirement.4). The raw material can be nickel silver, copper-nickel-zinc alloy, stainless steel, tinplate, etc ... It depends on your requirement. 5). Surface coating: zinc, silver, copper, black oxide, etc. 6). We can offer test ... specification: Item NameDescriptionMaterialStainless steel, carbon steel, tinplate, nickel silver, phosphor copper, beryllium bronze, Zinc alloy, aluminium and other ...