Talk:Sign/@comment-100.14.187.239-20160510215328/@comment-28208230-20160511144008

Copper is for the circuitry. You could use silver or gold, but in real life those materials are more rare, hence why copper is typically used. Metals are out of balance now, but I expect they'll refine that over time.


 * EDIT* I just looked it up, and it turns out Aluminum is also a great conductor of electricity. So you are right, they could just as easily use Al instead of Cu.