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I always hear that demo bindings weigh more then regular ones. On my Nordica Top Fuels I have the Marker System 312IT in a demo and on my Speedmachine 14's I have the same binding, but it's not a demo. The only difference between the two seems to be the tab on the toe piece and the heel piece that you press in to easily move the binding up and down the rails. I can have the same movement with the regular bindings, I just would have to keep screwing them in and out of the rails.

I don't think there is any weight difference. If I'm wrong please let me know.