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http://www.brickowl.com/catalog/lego-gear-with-8-teeth-wide-notched-and-no-friction-11955

As title, what does "No Friction" mean in the part "Gear with 8 Teeth Wide, Notched and No Friction" ?

4

In the case of this item, it means that the gear will slide freely along the axle it rotates around.

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