World Champion ACER Racing 12x21x5mm Ceramic Ball Bearings. This is a 12x21mm ceramic ball bearing also known as a size 6801 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.
(Not for use inside Nitro Engines. For Nitro engines we offer a 12x21mm Ceramic Engine Bearing in our eBay store eBay item 260873898636)
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