Heavy metal, that is the good part. Color looks completely different than what picture depicting item looks like. I needed the brass color pictured, which I ordered, to match the other drawer pulls already on dresser. The color was the reason I ordered these over other knobs. All ten knobs are so dark they are just shy of an antique bronze. They appear almost black against my ivory dresser. If you look at color pictured for antique brass, it's very bright and obviously brass. Just bit of wear appearance to highlight brass. What i received is very disappointing. If it didn't have color name printed on label I would think it was error in order.