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  • Rights: The University of Waikato Te Whare Wānanga o Waikato Published 9 April 2010 Size: 9.2 MB Referencing Hub media

    Many skateboarders choose silicon nitride ball bearings (inset) for smooth, low-friction wheel characteristics. Silicon nitride is a hard, tough ceramic with excellent wear resistance.

    Skateboarder photo ChrisGoldNY, CC BY-NC 2.0, sourced from Flickr.

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