Ceramic bearings for motor?

[shartinspartin]

Does anybody here use ceramic bearings in their motor?
If so can you please link the ones you have here?
Thanks

[shartinspartin]

http://www.bocabearings.com/search.aspx?SearchType=StartDimension&radix=metric&Inner=5.0000&Outer=14.0000&Width=5.0000&InnerOperator=%3d&OuterOperator=%3d&WidthOperator=%3d

Does anybody know which ceramic bearings in this link is the right one?

[PowerDemon]

The bearings in the motor are machine pressed into the back plate of the motor. So says Castle Creations.