Dainty, delicate hardware - a little piece of readymade art for your ears, our Bolt Studs in Titanium are now available in implant grade titanium for 24/7 waterproof, sweatproof, lifeproof wear. Specs & Sizing Solid implant grade titanium Gold version is coated in 18k gold PVD Plating 3mm in diameter 20G post, 6mm wearable surface, 10mm total length Solid titanium ball backings for a sculptural look