Product Details Hypoallergenic Flat Back Earring18 Gauge 5/16 3mm CZ Star Implant Grade Titanium Push In Threadless Stud Earring Simple and classic body jewelry is always in style, like this 18 gauge ear piercing ring. It's made with an 8mm ASTM F-136 implant grade titanium straight post with a flat disc back. It features a 3mm clear cubic zirconia prong-set gem star top that features a threadless design, for maximum comfort on insertion and removal and making it easy to change the end. 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 star.Specifications18 Gauge (1mm), 5/16" (8mm), 3mm Prong Setting with Cubic Zirconia, ASTM F136 Implant Grade Titanium, Threadless, Push In, Flat Back