They are plastic, but i wouldn't say flimsy. Good rtr beginner boats with the stock gear. Can be modded slightly to get 25-30mph. If your expecting any more speed from those hulls it would be a waste of time in my opinion due to bad handling characteristics of those hull at high speeds.
I have the rio ep and actually really like it. The 2.4 radio is really nice and the hatch is really easy to seal with electrical tape. It's good for about 18mph out of the box.
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