The stuff is spooled on wheels smaller than the large wire cable spools it eventually gets put on when wrapped - it bends but obviously doesn't break. The amount of core on a spool should match the length of cable that is put on a spool.
Taizu - A 7' length of core can be bent around end to end by a normal strength man. Also, I think a full spool of core hold about 3 miles, but I don't remember for sure. I hope that helps.
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