FREE SHIPPING WORLDWIDE

World Champion ACER Racing 5x11x4mm Ceramic Ball Bearings.  This is a 5x11mm ceramic ball bearing also known as a size MR115 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.