They definitely don't flash but I don't think it's necessary as they are flexible and move at the slightest pressure. As you can see in the photo, one stands fairly evenly, the other not so much. I'm sure I could play around with this, rearranging the segments to see if I can get it straight, but it still serves the purpose - even with the curve I set the spacing so I know how far I'm going have to pull up. Easy to assemble and weighs just enough not to tip over.
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