bestofgoodbuys,in my opinion it hard to replace the thing that works the best!Copper wire for example,they tried aluminum wire,does not work well,it causes fires,and people will spend the extra money to not burn when they are sleeping.As a matter of fact it is illegal to use.And for steel pennys what for?people are creatures of habit,i don't think they will put them in there pocket,its hard to find replacements for our metals that are any cheaper.JMHO,paliman