Don't worry; the .5 inch tall stainless steel Superman Silver & Black Symbol Cufflinks are not made from Black Kryptonite. We use to make them out of that but then we got a lot of complaints of people turning evil or getting a bad case of 'the duplicates'. Needless to say, we don't do any more business with Lex Luthor. You'll be set to don the Superman Silver & Black Symbol Cufflinks to your next fancy-pants event where you'll wow everybody with your unique sense of style!