Pretty sure it's steel, not iron. All of the tubing is hollow and has vent holes near the welds. That's common on cheap bike frames, but kind of off-putting on something decorative. They're not that easy to see because there's so much going on. On mine, some of the studs that hold the arms with the balls were not straight, so their spacing is a little irregular. Again, hard to tell. Also, one of the nuts stripped out, when I put it together. Mine also had a random extra loop welded on (little loops hold the balls). The glass balls make up for all of the poor Chinese construction. There are 35 of them and they make the whole thing look amazing! When assembling, do yourself a favor and use some small wire nuts when wiring the five light arms to the main wire. The instructions just say to twist them together, which is a fire waiting to happen.