Product Details 18 Gauge Titanium Flat Back Earring Threadless Reversible Heart Super Comfy Flat Backs - Designed for all day wear without poking your neck or squeezing your earlobes Threadless Flat Back -Provides a secure fit for all day wear including sleeping and naps; no need to take them out Flower Shape Back - A charming change from the standard disc shape providing an Easier Grip for insertion and removal Medical Implant Grade Titanium - Hypoallergenic earrings; perfect for even sensitive ears Reversible Flat Back - This flat back earring can be worn both ways; reversed for twice the style. Elegant, stylish, fashionable earrings that will make you shine. Specifications 18 Gauge (1mm), 1/4" (6mm), ASTM F-136 Implat Grade Titanium, Threadless, Push In, Hypoallergenic