World Champion ACER Racing 13x19x4mm Ceramic Ball Bearing.  This is a 13x19mm ceramic ball bearing also known as a size 13x19x4mm ball bearing. The inner diameter is 13mm,outer diameter is 19mm and the width is 4mm.  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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