It's a metal sign...but very thin metal, poor quality for the cost.
I would have just ordered locally if I had know how absolutely thin this is.  It's so thin, it was received all bent up.  The flat packaging doesn't protect it enough to not be bent, which it should given the poor quality material.  It bends like a thin piece of lead.  Paper clips have more rigidity.  I wouldn't recommend.  More fasteners holes are need to properly secure this to any surface. As the four provided, don't flatten it out enough especially when received bent.
Rating: 2 stars