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Silicon nitride ball bearings
An example of the element Silicon

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Silicon nitride ball bearings.
Ball bearings made of extremely hard silicon nitride.
Source: eBay seller irvineman
Contributor: Theodore Gray
Acquired: 28 March, 2009
Text Updated: 29 March, 2009
Price: $4/each
Size: 0.375"
Composition: Si3N4
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