Copper Spark Plug
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Spark Plug.
Lord only knows what else you could make the core of a spark plug out of, but this one prominently advertises the fact that it's made of copper. I got it to go with my collection of spark plug elements, which is surprisingly diverse, extending even to man-made radioactive elements.
Here's an interesting article about different elements in spark plugs.
Source: Farm & Fleet
Contributor: Theodore Gray
Acquired: 19 November, 2002
Text Updated: 11 August, 2007
Price: $2
Size: 3"
Purity: >95%
Sample Group: Spark Plugs
Copper