The Batman Black Die-Cut 316L Surgical Steel Stud Earringsis proof that Wayne Industries really is all over the place Made from high quality bio-compatible surgical steel and highlighting an ornate die cut bat symbol Say, I wonder how Wayne Industries has all of this bat related stuff? They better be careful, or the Batman might sue or come after Bruce Wayne I don't think that little rich boy could put up a fight against the Batman, though come to think of it I haven't seen him around as much as one might think. Oh well. 316 Surgical Stainless Steel is the preferred steel where bio-compatibility is required (such as body implants and piercings). The "L" means that the carbon content of the alloy is below 0.03%, which reduces the sensitization effect. 316 steel has .08 Max carbon content while 316L has a .03 Max carbon content. Stainless steel does not contain, corrode, or rust as easily as ordinary steel. Though it will not oxidize or turn black, it is still not "stain-proof."We cannot accept exchanges and refunds on body piercings. That stuff was in your body Ewww All sizes are US sizes.