World Champion ACER Racing 5x12x4mm Ceramic Ball Bearing. This is a 5x12mm ceramic ball bearing also known as a size 5x12x4mm ball bearing. Diamond polished Silicon Nitride (Si3N4) Balls, HSR cage technology and sealed on both sides. Lubricated with lightweight ACER Racing lube for super fast and super smooth action. Can be used anywhere a 5x12x4mm bearing is required including in clutches. ACER Racing lightweight ceramic ball bearings last longer and spin faster.
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