Lots of people get confused over the difference between sealed bearings and shielded bearings. All skateboard bearings have shields on at least one side. Some are double-shielded. Sealed bearings have a shield made of metal and a coating over them. The seal protects the bearings from dirt, moisture and road salt. While shielded bearings have the benefit of producing no friction, there is a tiny amount of open space where dirt and moisture can enter. The choice is yours.

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