Our classic hoop earrings, featuring an elegant single row of crystals, now available in medical grade titanium for 24/7 waterproof, sweatproof, lifeproof wear. The perfect hoops to anchor your ear party. Specs & Sizing Solid medical grade titanium with high quality CZ crystals 18K Gold PVD Plating 13mm exterior diameter, 11mm interior diameter Standard 20g posts Hypoallergenic and always nickel free