  Silicon nitride skateboard bearing.
I really hope it doesn't make any difference whether you have steel ball bearings in your skateboard, or these incredibly expensive solid silicon nitride models. They do spin very smoothly for a very long time, but still, can it really make any appreciable difference?
Silicon nitride is an extremely hard ceramic, but I'm kind of surprised that these things are not too brittle to last very long with people jumping up and down on them.
Source: eBay seller irvineman
Contributor: Theodore Gray
Acquired: 24 March, 2009
Text Updated: 25 March, 2009
Price: $60
Size: 0.75"
Composition: Si3N4
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