Product Details Hypoallergenic Flat Back Earring16 Gauge 1/4 3mm Black CZ Round Implant Grade Titanium Internally Threaded Stud Earring Simple and classic body jewelry is always in style, like this 16 gauge body piercing jewelry. It's made with a 6mm ASTM F-136 implant grade titanium straight post with a flat disc back. It features a 3mm black cubic zirconia prong-set gem top that features an internally threaded design, for maximum comfort on insertion and removal. Best of all, you can wear it in multiple piercings including earlobe, tragus, helix, and some conch piercings. Classic jewelry and modern style make this elegant flat back earring a winSpecifications16 Gauge (1.2mm), 1/4" (6mm), 3mm Prong Setting with Cubic Zirconia, ASTM F136 Implant Grade Titanium, Internally Threaded, Flat Back