Super thin metal tubing bent to shape. Not iron. Cheap thin tubing that was bent making malformations in the metal. All the details are just tack welded on. They didn't even try to hide that fact. Not many holes lined up with the threaded inserts. In fact. I had to twist the entire frame to get the last two screws in. Another screw cross threaded. So cant take it apart to move it. It looks great from a distance, but once you get close you see all the defects and cheap labor. One good thing is it is sturdy, No squeaking. I wouldn't recommend more than 400-425 lbs. max. I sleep alone most nights and I weigh 220. It holds me up fine. The full size mattress I bought for this frame is about 6 inches narrower than this frame. Leaving 3 inches on both sides. Not cool. I wouldn't recommend and wouldn't buy again.