Titanium beaded halo screw-on flat back single earring features a sparkling crystal center with a delicate beaded border. Worn on helix, flat, conch, and upper lobe piercings. Details Medical grade Titanium | Hypoallergenic, lead and nickel free White Zirconia Gemstone Front Diameter: 4mm(0.16in) Post Length 6mm, Thickness 1.2mm(16ga) Front threaded screw closure on 4mm disc flat back Titanium Sold as single, purchase two for a pair Worn area: Upper Lobe, Helix, Conch