Process : Copper stamped or zinc Alloy injection with. Material : Copper or zinc Alloy. Enamel : Semi- Cloisonné Standard thickness : 1.2mm Plating : Gold/ Antique Gold/ Silver/ Antique Silver/ Nickel/ Black Nickel Antique Nickel/ Copper/ Antique Copper Brass/ Antique Brass /Dyed Black Epoxy coating : No. Attachment : Various.