Every race car should have these equiped. They replace the plastic bushing that comes with your kit car. Some older cars have a plastic bushing with a brass insert (save these for future use).
Although they are sealed and leaving the seal on them seems like common sense, many racers remove the black rubber seals on both sides to allow the bearings to spin more freely. These also allows you to soak them in your choice of cleaning agent to clean them after use or before races.
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