No brass, the color is coating to make it not oxidize. I've used mine on my R6 for years, PM me if you are having issues, would be more than happy to get you a replacement one.What sort of steel is used for these? I got mine cut, attempted to open my gas cap and it promptly got a bit of a twist in it. Me thinks the metal is softer than the original keys...it has a bronze-like tinge to it. Some brass in there?