6902 Ceramic Ball Bearing from World Champions ACER Racing. This is a 15x28x7 mm ceramic ball bearing also referred to as a 61902 bearing.  Uses diamond polished Silicon Nitride Ceramic Balls. Price is for one 6902 ball bearing so please choose the quantity you wish to order. 

The advantages of our ceramic bearings are vast including lighter weight, lower friction and heat, greater speeds and much greater durability. Full sealed on both sides with removable seals.