Threadless post made from 316L surgical steel with 3mm disc or 4mm disc (we have 2 suppliers making this for us). The CZ leaf is made from surgical steel and brass and is pvd plated when colored. All posts are plain surgical steel only the tops have the plating when colored.
Because brass contains copper, it can oxidize with moisture or skin chemistry and leave a harmless greenish tint on the skin. It isn’t an allergic reaction, but it does make these pieces better suited for occasional or event wear rather than daily use.