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Those small pieces are wheel stoppers designed to secure the wheels of your Nebula X1 Pro.

You can use them when the projector is placed on a smooth or slightly inclined surface, to keep it from moving and ensure stability.

In most regular setups, you probably won’t need to use them, but it’s good to keep them handy just in case. 

If the above solutions cannot solve your issue, please contact Nebula Customer Support at service@soundcore.com  for further assistance.