6304ZZ Ball Bearings 20x52x15 Lot of 10 Bearings Pack of 10 bearings 6304ZZ for use in many ATV's, Bearings are made of Chrome Steel and can rotate up to 15,800 rpm with no problem, each bearing has 2 Metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease, Bearings are packed in the original manufacturer bag.