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steel reinforced polyurethane. i think i said because the steel makes it really rigid so it will resist breaking, and i wasn't sure but i said polyurethane is hard so it can't be cut or scratched easily, ie. vandalism. i can't remember if that was all i said. what was the question?

yeah two cables supporting a door

divide it by two (two cables)!! 1.6mm was a far better answer

yeh i said it could easily be turned on and off when energy is in demand.