Product Details Hypoallergenic Flat Back Earring18 Gauge 5/16 Rectangular White Synthetic Opal Gold PVD Implant Grade Titanium Push In Threadless Stud Earring Timeless style and striking colors mean this 18 gauge body jewelry is always in style. It's made with an 8mm gold tone PVD over ASTM F-136 implant grade titanium straight post with a flat disc back. It features a white synthetic opal set into a rectangle shaped 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, and nostril piercings. Classic jewelry and modern style make this elegant flat back earring a a winner.Specifications18 Gauge (1mm), 5/16" (8mm), Gold Tone PVD over ASTM F136 Implant Grade Titanium Threadless Push In Labret, Synthetic Opal