The Thor Yellow and Black 316L Surgical Steel Barbell is created in the forges of mighty Asgard by tireless workers of the Great Furnance the Superfreakinhotigar. Designed by specific requirements set forth by Thor the Thunder God the Thor Yellow and Black 316L Surgical Steel Barbell are for mortals...or as they call us Midgardians! Made from high quality 316L bio-compatible surgical steel and featuring a black and yellow image of Thor s mighty hammer Mjolnir! 316 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 percent 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.