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3D3DZirconium oxide street luge bearing.
This is a solid zirconium oxide ceramic ball bearing meant for street luge, whatever that is. See similar silicon nitride ball bearing.
Source: eBay seller irvineman
Contributor: Theodore Gray
Acquired: 24 March, 2009
Text Updated: 25 March, 2009
Price: $30
Size: 0.75"
Composition: ZrO2
Zirconium