Metal key chains are died from copper, brass, iron or casted zinc alloy. They have different shapes and sizes, are plated with gold, silver, brass, nickel, black nickel, chromium, copper (The metal platings).  The surface of the key rings can be polished, mat (opaque), with texture or antiqua (raised areas are lighter and recessed areas are darker). They can be with relief (2D or 3D engraving) or covered with colour enamels (The producing technology).  The key rings have different attachments (Key rings attachments) and packed into boxes (Boxes).