Dainty, delicate hardware - a little piece of readymade art for your ears, our Bolt Studs are now available in implant grade titanium for 24/7 waterproof, sweatproof, lifeproof wear. Also as as a titanium flat back for cartilage piercings and our signature Bolt Nap Earrings. SIZE & FIT Earring top: 3mm diameter Post gauge: 20g (standard piercing) Sphere backings — a secure, adjustable alternative to our flat-back styles Best for first or second lobe MATERIALS & CARE Materials: Medical-grade (ASTM F-136) titanium. Hypoallergenic and safe for sensitive skin. Finish: Our jewelry is bonded with Titanium Nitride PVD to best match your 14k gold and fine silver jewelry. Titanium nitride is a hypoallergenic material that is more durable and resistant to wear than traditional gold plating. PVD coating is also more environmentally friendly than traditional plating. Care: Waterproof and tarnish resistant. To maintain shine, polish with a soft cloth. SHIPPING & RETURNS Free standard US shipping on orders over $150 Easy returns and exchanges