Rendered in a very sturdy, subtly shiny, and very infection-free stainless steel, our Captain America Shield Stainless Steel Stud Earrings are scaled down reproductions of Captain America's handy-dandy shield-thing Measuring .25" in diameter, these stainless steel Captain America earrings are perfect little accents for earlobes demanding the appropriate, patriotically-inclined ear-wear. Seeing as you're very patriotic, and a HUGE fan of Captain America -- HYDRA sympathizer or not -- these Captain America earrings are the perfect, selfless self-gift And have I mentioned they're stainless steel? I did? Well, it's important to mention this. Why? Glad you asked: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%, 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." All sizes are US sizes.