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What types of metal keychain can be used as advertising keychain?

Generally speaking, different types of metal keychains can be used as advertising key chains, the key is that we have to choose and develop appropriate metal key chains according to the purpose of advertising and audience, usually their logo is different, the material and size are different. In the process of custom logo keychain, we often use zinc alloy, copper, stainless iron, stainless steel and other materials. And different metal materials have different process requirements, such as engraving, printing, coloring, electroplating, polishing, laser, relief and so on. When we can make an attractive metal key chain, it will be more popular with people.