... Office Cutting Supplies Metal Letter Opener with Smooth Shiny Shape Material Zinc Alloy, Iron, Leather, Brass, etc.ColorMetalCraft Stamping, ... process: 1) Mold making, to make your design on the mold surface, 2) Injection, metal material injected into the mold 3 ... ) Elimination, on completion of injection, unwanted material is eliminated to reveal the completed design 4) Polishing by hand ...