6804 Ceramic Ball Bearing from World Champions ACER Racing. This is a 20x32x7mm ceramic ball bearing.  Uses diamond polished Silicon Nitride Ceramic Balls. Price is for one 6804 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 lower heat, greater speeds and much greater durability. Fully sealed on both sides with removeable seals.