Product DetailsTitanium Reversible Flower Flat Back Stud 18G Synthetic Opal Ball Hypoallergenic Implant Grade Titanium Flat Back Earring. Get triple the style with this 18 gauge reversible flat back earring. It's made with a 6mm ASTM F-136 implant grade titanium straight post. The front end features a color synthetic opal ball end for total trendy style and it also features an internally threaded design for maximum comfort on insertion and removal. The back end features a flower shape, for a charming change from the standard disc shape and you can wear it reversed for twice the style. You can even rock this jewelry in multiple piercings including tragus, helix, and some conch piercings. With such an endearing style and such thoughtful details, this flat back earring is will have you blooming into style.Specifications18 Gauge (1mm), 1/4" (6mm), ASTM F-136 Titanium Straight Post, Externally Threaded Synthetic Opal Ball, Internally Threaded Post, Reversible Design