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Re: Ramps
I would have to do some testing but, I would guess vinyl coated 1/8" cable should work pretty well. Stiff enough to not be easy to tangle up in drive trains small enough to be almost unnoticed by wheels of most types, and available in a variety of bright colors to contrast against both blue and red. If you have a robot from previous years around, go grab some cable from the Orange colored big box store and drive over it a bunch.
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