Precision 8mm axle holes .4045″ built in spacers .5mm built in speedrings The coefficient of friction is the lowest in the field of Tribology at 0.003% creating a near frictionless surface. Mainly because the nanoceramic compound eliminates all asperities. Extremely low water washout Corrosion on the inside of the bearing is nearly eliminated. Sold in sets of 8 bearings. Green rubber seals to keep dirt and debris on the outside of the bearing. Zealous Bearings - 8mm Regular Longboard downhill skateboard
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