almost all body jewelry is stainless steel, fyi. it doesn't tarnish, it's easily cleaned w/alcohol, and it's hypoallergenic (for 99% of people). ;) if it's iridescent (think peacock colors, that change when the light shifts) or solid-colored (blue, red, black, etc), it's probably titanium. though some studs and hoops have plastic balls, this particular hoop looks to be all stainless. :)