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Turn any of the 3 rotating cogwheels and all 3 will turn. It would make an exciting 3-D printed pendant, jewlery centerpiece, keychain or desk toy.
The key ring bit is included and pre-printed to loop jewlery, key-ring, or other accessory to.
Messgae me if you have any questions or would like any customizations made to the 3D printed item. ~Tweet3D