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3D3DCox magnesium drop arm.
Some kind of bicycle part. Much smaller than you think, only about 1.5" long.
Source: eBay seller motoreyes
Contributor: Theodore Gray
Acquired: 2 April, 2009
Text Updated: 3 April, 2009
Price: $3.25
Size: 1.5"
Purity: 99%
Magnesium