Everything is plastic (except the "frame") but it seems to be assembled quite well. It's on the small side, so for those who want to know how long the cable will last, it entirely depends on the gauge (thickness) of the cable. I have a 50 foot 12/3 cable and this will make the most of the capacity. The main reason for the lower rating is that when unpacked it sounded like it was filled with sand and seeping into small particles. I removed the 3 screws holding the 4 outlet central block and the entire central cavity was filled with very fine steel shot (or some type of metal). It obviously shouldn't be there, so I'm not sure what's going on. Hopefully this doesn't affect the long term functionality of this item (like shorts etc).
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