It's described as brass wire, but it arrived with flaking already apparent, where the gold color was coming off. If it's brass wire it should not look black under the flaking. In fact, it should not flake at all.
Looking at this crownlet I was afraid this was going to be rather insubstantial and easily broken by an active 9yo girl...no worries here! This item is not as thin as it looks in the pics and is easily adjustable without worrying it is going to snap. The jewel in the crown is also very pretty and a very nice touch. This is a very good deal!