These brand new professional grade bearings by bronson speed co are pre lubricated for a smooth fast ridethey come in the standard size 608 with a 8mm core 22mm outer diameter and 7mm width and provide the best in performance and durability each set of bronson speed co g2 bearings contains eight 8 bearings which is enough for four 4 wheelsfeaturespack of 8industry standard sizepre lubricated for a smooth fast ridedeep groove racewaysstraight edge frictionless shieldshigh speed ce