Sputtering targets.
These are a pair of high-purity titanium sputtering targets (used, presumably, for vacuum-plating things with titanium). They ring beautifully: I must get a good recording one day.
Source: eBay seller choppermr
Contributor: Theodore Gray
Acquired: 10 August, 2004
Price: $1
Size: 12"
Purity: 99.9%
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