It's 1/2" CPVC. They are flimsy as can be, and would blow away in the wind, but there is no wind inside the greenhouse. The cheap painter's drop cloths are fine as plastic, too.
If I was making hoops outside, I would probably use metal conduit and 6-mil greenhouse plastic. Even then, anchoring the plastic is a pain. The past two days have had 40 mph wind gusts.
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