World Champion ACER Racing 1/4x3/8x1/8 Ceramic Ball Bearing. This is a 1/4x3/8 ceramic ball bearing also known as a size R168 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. ACER Racing lightweight ceramic ball bearings last longer and spin faster. Also can be used as a yoyo bearing.
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