| | | Sputtering target. This is supposedly a boron doped silicon sputtering target.  I have not researched whether that is a sensible claim or not, though it does look and feel like silicon.
 Source: eBay seller matky
 Contributor: Theodore Gray
 Acquired: 10 September, 2004
 Price: $37
 Size: 4"
 Purity: 99%
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