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Best Answer: Well wire hangers can be made out of platinum, silver, iron, copper, aluminum and gold because of their ductility; and it is only from these and certain of their alloys with other metals, principally brass and bronze. Source(s):
This can give a clear or tooth-colored appearance to the braces. When appropriate, the wires can be made of materials such as nickel-titanium or copper-titanium. These materials may be longer lasting and require fewer adjustments than stainless steel wires. Clear, invisible trays are now available.