Product Details18 Gauge 5/16 3mm CZ Gem Implant Grade Titanium Push In Threadless Reversible 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 gem round top that features a threadless design, for maximum comfort on insertion and removal and making it easy to change the end. The back end features a square shape, for a charming change from the standard disc shape and you can wear it reversed for twice the style. 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), ASTM F136 Implant Grade Titanium, Threadless, Push In, Flat Back, Reversible, Cubic Zirconia