Iron Stamp Lapel Pins Iron soft enamel are often used as promotional giveaways because they are the least expensive out of the die struck group. Yet Iron has a slight disadvantage compared to copper since it is a harder metal; therefore, when being struck by the die, iron pins typically have less sharp images. The appearance of this process is almost same as die struck soft enamel, however, you still can tell the difference from observing metal line. Iron soft enamel is electroplated by a rolling machine, with no polishing necessary after hand-enamel. Using bronze and nickel instead of gold and silver respectively. A clear epoxy coating for extra durability is available for a nominal charge.