World Champion ACER Racing 8x16x5mm Ceramic Ball Bearing.  This is a 8x16mm ceramic ball bearing also known as a size 688 ball bearing. Diamond polished Silicon Nitride (Si3N4) Balls, HSR cage technology and sealed on both sides. Lubricated with lightweight and 100% synthetic ACER Racing SIN Oil instead of thick grease for super fast and super smooth action.

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