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The Independent Genuine Black Precision Bearings where engineered with exclusive features. They have removable non contact Labyrinth shields, heavy duty grit blocking cage, micro polished steel races. They also have Shell Morlina S2 light oil lubricant, excellent oxidation resistance and corrosion protection, water resistants you still want to try and not get them wet and extended wear protection. The bearings also come with bearing spacers and extra truck washers.