As far as i am aware at least on battlebots the floor was steel, with a thin layer of rubber-ish stuff on it. that's why beta and chomp still jumped when they hammered, magnets didn't work.
Rumors say at least for beta a vacuum pump instead of magnets is in planning/testing... but i have no idea if that is true, would wonder if the weight used for it is worth it.
anyway, with magnets you always have to make sure they are used according to the rules, so no damage to the other bot through them.
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