These Silver Stud earrings are each completely one-of-a-kind. I have wrapped a coiled random wire knot and made into a stud earring using both Sterling Silver and 14k yellow Gold Filled wire Sterling silver earring back. The knot measures about 6mm or 1/4" inch. They are each different, but I try to stay consistent with size so they will match. They are my most popular earring, I have made hundreds of them. Each one, just a bit different than the next. As always, they will come in a cute gift box.