World Champion ACER Racing 6x13x5mm Ceramic Ball Bearings.  This is 2pc 6x13 mm ceramic ball bearing also known as size 686 ball bearings. 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.

Price is for two size 686 ceramic ball bearings.