World Champion ACER Racing 8x16mm Flanged Ceramic Ball Bearings.  These are 8x16x5mm Flanged ceramic ball bearings also known as a size MF688 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.

Performance upgrade for Team Associated 91565 bearing

Price is for TWO bearings as shown