These earrings are created with hand picked shark teeth fossils found locally in St. Augustine, FL. They are attached to 4mm or 6mm titanium and stainless steel flat back posts. * Tarnish-proof, hypoallergenic titanium and stainless steel. * Real shark tooth found by Always Augustine in St. Augustine, Florida. Our earrings go through rigorous testing to ensure you can wear them all day, every day, without tarnishing. Feel free to wear your earrings in the ocean, in the shower, or even during a workout! Each piece will vary and be unique due to the organic nature of fossils.