They are very light. On the first bump, as the plow leaned forward and snow hit the top of the marker, the marker folded up and the plastic crumpled to keep it from rising. It's hollow plastic with no memory. Once it's bent, that's it. Another soon disintegrated. Yes I've used them on a real plow and they say UTV but still. I don't use them professionally. One positive thing, they were very noticeable when held on.
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